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2018-10-12 出处:网络 整理:myviralweb.com

    话题:(30+4)x25的简便计算该怎么 做啊????

    回答:850解析:(30+4)*25=30*25+4*25=750+100=850

    话题:55x25

    回答:55x25-25x45+30x25=(55-45+30)x25=1000(30+4)x25的简便计算该怎么做啊

    话题:(30+4)x25的简便计算该怎么 做啊????

    回答:850解析:(30+4)*25=30*25+4*25=750+100=850

    话题:简便运算725/25+275/25 30

    回答:725/25+275/25=(725+275)/25=1000/25=40 30-8.12-4.13-7.75=30-(8.12+4.13-7.75)=30-(12.25-7.75)=30-4.5=25.51.2*5.7-1.2+5.3*1.2=1.2(5.7-1+5.3)=1.2*10=12

    话题:四年级下册简便运算

    回答:四年级下册第三单元简便运算举例、练 第一种 (例) 25x(4+8) 125x(8+8) (11+25)x8 =25 x4+15 x8 =100+120 =220 第二种(例)84x101 504x25 78x102 25x204 =84 x(100+1) =84 x100+84 x1 =8400+84 =8484 第三种(例)99x64 99x16 638x99 999x99 =(100-1) x64 =100 x64-1 x64 =6400-64 =6336 第四种(例)99X13+13 25+199X25 32X16+14X32 78X4+78X3+78X3 =(99+1)x13 =100 x13 =1300 第五种(例)25X32X125 125X32X8 88X125 72X125 =(25 X4) X(8 X125) =100 X1000 =100000 第六种(例)3600÷25÷4 8100÷4÷75 3000÷125÷8 1250÷25÷5 =3600÷(25 X4) =3600÷100 =36 第七种1200-624-76 2100-728-772 273-73-27 847-527-273 =1200-(624+76) =1200-700 =500 第八种278+463+22+37 732+580+268 425+14+186 =(278+22)+(463+37) =300+500 =800 第九种 214-(86+14) 787-(87-29) 365-(65+118) 455-(155+230) =214-14-86 =200-86 =114 第十种 871-299 157-99 363-199 968-599 =871-300+1 =571+1 =572 第十一种 178X101-178 83X102-83X2 17X23-23X7 35X127-35X16-11X35 =(101-1)X178 =100 X178 =17800 第十二种 64÷(8X2) 1300÷(13 X5) 480÷(8 X2) =64÷8÷2 =8÷2 =4 第十三种 625÷25 360÷24 270÷45 =625÷5÷5 =125÷5 =25 第十四种100+45-100+45 25+75-25+75 423+76-76+77 243+85-243+85 =(100-100)+(45+45) =0+90 =90 第十五种20X4÷20X4 25X4÷25X4 56X8÷56X8 12X6÷12X6 =(20÷20)X(4X4) =1 X 16 =16 练:169+354+231+146 987-362-138 1347-(347+125) 135+236-135+236 198 X26 148 X56-48 X56 210÷15 199 X37+37 215 X63-15 X63 101 X22-22 203 X14 125 X33 X4 125 X16 X50 365+997 452-398 简便运算题 1.加法律(a+b=b+a) 如:152+389+348 =152+348+399 =500+399 =899 题:77+56+23 165+477+135 154+288+46 2.加法结合律a+b+c=a+(b+c) 如:591+482+118 =591+(482+118) =591+600 =1191 题:285+147+253 99+178+122 456+588+412 692+325+75 3.加法律、结合律 如:32+29+68+41 =32+68+29+41 加法律 =(32+68)+(29+41) 加法结合律 =100+70 =170 题:(148+64)+(52+136) 650+(171+350)+129 128+114+86+1724.乘法律a*b=b*a 如:25*45*4 =25*4*45 =100*45 =4500 25*31*4 125*27*8 40*69*25 5.乘法结合律:a*b*c= a*(b*c) 如:78*125*8 125*32 =78*(125*8) =125*(8*4) =78*1000 =125*8*4 =78000 =4000 题:52*25*4 125*72 125*88 25*32 25*44 125*48 6.乘法律、结合律 如:125*4*8*25 =125*8*4*25 乘法律 =(125*8)*(4*25)乘法结合律 =1000*100 =100000 题:125*25*32 7.乘法分配律:a*(b+c)=a*b+a*c 如:27*57+27*43 27*99+27 27 *99 =27*(57+43) =27*(99+1) =27*(100-1) =27*100 =27*100 =27*100-27*1 =2700 =2700 =2673 题:67*34+67*66 127*43-27*43 27*101-27 27 *101 67*21+67*78+67 67*23+67*78+67-67 12*340+66*120 25*44 125*88 85*102 69*102 78*98 65+65*99 5*87+87+87*4 8.减法运算质; a-b-c=a-(b+c)=a-c-b 如:781-178-122 721-488-121 745-(245+188) =781-(178+122) =721-121-488 =745-245-188 =781-300 =600-488 =500-188 =481 =112 =312 题: 456-273-127 623-169-223 553-(289+153 ) 772-456+228 689-(289-153 ) 136-88+164-112 9.除法运算质;a ÷b ÷c=a ÷(b*c)=a ÷c ÷b 如:720 ÷ 36 ÷ 2 =720÷( 36 *2) =720 ÷ 72 =10 题:2700÷25÷4 5600÷25÷56 3900 ÷(39*4) 怎样简便怎样算。 一、355+260+140+245 98*101 48*125 645-180-245 38*99+38 3500÷14÷5 175*56+25*56 50*25*20*40 二、368+156+344+132 125*47*8 7200÷25÷4 44*25 96*58+96*42 6300÷(63*5) 482 -(182+50) 135*27+135*72+135 三、368+156+344+132 125*47*8 7200÷25÷4 44*25 96*58+96*42 6300÷(63*5) 482 -(182+50) 135*27+135*72+135 四、789-136-64 132*29+132 98*83+166 3700÷4÷25 88*1250 48*125 125*32*125 36*88+36*15-108 五、355+260+140+245 98*101 48*125 645-180-245 38*99+38 3500÷14÷5 175*56+25*56 125*32*25 六、98+265+202 273-73-27 250*13*4 3200÷4÷25 88*125 99*38+38 17*23-23*7 72*125 七、64*15-5*64 25*(12*40) 99*56+56 2182-1655-345 3200÷4÷25 298*99+298 (40+8)*25 97*8*125 八、355+260+140+245 102*99 2*125 645-180-245 382*101-382 4*60*50*8 35*8+35*6-4*35 125*32 九、25*46 101*56 99*26 1022-478-422 987-(287+135) 478-256-144 672-36+64 36+64-36+64 十、487-287-139-61 500-257-34-143 2000-368-132 1814-378-422 89*99+89 155+264+36+44 25*(20+4) 88*225+225*12 十一、698-291-9 568-(68+178) 561-19+58 382+165+35-82 236+189+64 759-126-259 25*79*4 569-256-44 十二、216+89+11 57*125*8 1050÷15÷7 169*123—23*169 37*99+37 129*101—129 149*69—149+149*32 56*51+56*48+56 十三、125*25*32 24*25 125*

    话题:求100道简单的5年纪简便运算题

    回答:1125-997 998+1246+9989 (8700+870+87)÷87 1. 3/7 * 49/9 - 4/3 2. 8/9 * 15/36 + 1/27 3. 12* 5/6 – 2/9 *3 4. 8* 5/4 + 1/4 5. 6÷ 3/8 – 3/8 ÷6 6. 4/7 * 5/9 + 3/7 * 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 * 5/6 + 5/6 10. 3/4 * 8/9 - 1/3 11. 7 * 5/49 + 3/14 12. 6 *( 1/2 + 2/3 ) 13. 8 * 4/5 + 8 * 11/5 14. 31 * 5/6 – 5/6 15. 9/7 - ( 2/7 – 10/21 ) 16. 5/9 * 18 – 14 * 2/7 17. 4/5 * 25/16 + 2/3 * 3/4 18. 14 * 8/7 – 5/6 * 12/15 19. 17/32 – 3/4 * 9/24 20. 3 * 2/9 + 1/3 21. 5/7 * 3/25 + 3/7 22. 3/14 ** 2/3 + 1/6 23. 1/5 * 2/3 + 5/6 24. 9/22 + 1/11 ÷ 1/2 25. 5/3 * 11/5 + 4/3 26. 45 * 2/3 + 1/3 * 15 27. 7/19 + 12/19 * 5/6 28. 1/4 + 3/4 ÷ 2/3 29. 8/7 * 21/16 + 1/2 30. 101 * 1/5 – 1/5 * 21 31.50+160÷40 (58+370)÷(64-45) 32.120-144÷18+35 33.347+45*2-4160÷52 34(58+37)÷(64-9*5) 35.95÷(64-45) 36.178-145÷5*6+42 420+580-64*21÷28 37.812-700÷(9+31*11) (136+64)*(65-345÷23) 38.85+14*(14+208÷26) 39.(284+16)*(512-8208÷18) 40.120-36*4÷18+35 41.(58+37)÷(64-9*5) 42.(6.8-6.8*0.55)÷8.5 43.0.12* 4.8÷0.12*4.8 44.(3.2*1.5+2.5)÷1.6 (2)3.2*(1.5+2.5)÷1.6 45.6-1.6÷4= 5.38+7.85-5.37= 46.7.2÷0.8-1.2*5= 6-1.19*3-0.43= 47.6.5*(4.8-1.2*4)= 0.68*1.9+0.32*1.9 48.10.15-10.75*0.4-5.7 49.5.8*(3.87-0.13)+4.2*3.74 50.32.52-(6+9.728÷3.2)*2.5 51.(375+1034)+(966+125) 52.(2130+783+270)+1017 53.99+999+9999+99999 54.7755-(2187+755) 55.2214+638+286 56.3065-738-1065 57.899+344 58.2357-183-317-357 59.2365-1086-214 60.497-299 61.2370+1995 62.3999+498 63.1883-398 64.12*25 65.75*24 66.138*25*4 67.(13*125)*(3*8) 68.(12+24+80)*50 69.704*25 70.25*32*125 71.32*(25+125) 72.88*125 73.102*76 74.58*98 75.178*101-178 76.84*36+64*84 77.75*99+2*75 78.83*102-83*2 79.98*199 80.123*18-123*3+85*123 81.50*(34*4)*3 82.25*(24+16) 83.178*99+178 84.79*42+79+79*57 85.7300÷25÷4 86.8100÷4÷75 87.16800÷120 88.30100÷2100 89.32000÷400 90.49700÷700 91.1248÷24 92.3150÷15 93.4800÷25 94.21500÷125 95.123*43-43*23 96.175-75÷25 97.4800÷75+36 98.47.83-(6.83+13.5) 99.(947-599)+76*64 100.2800÷ 100+789 125*8.8 1.3+4.25+3.7+3.75 17.15-(3.5-2.85) 3.4*99+3.4 4.8*1.01 0.4*(2.5÷73)(1.6+1.6+1.6+1.6)*25 ( + - )÷ 12.3-2.45-5.7-4.55 2 + 0.125*0.25*64 64.2*87+0.642*1300 78*36+7.8*741-7 17+ 8 0.125* +0.5 2.42 +4.58 -43 25÷100 4.25-3 -(2 -1 ) (1)1.25*17.6+36.1/0.8+2.36*12.5 (2)7.5*2.3+1.9*2.5 (3)2004/2003*2005 (4)276*543-267/276+543*275 (5)17/51+ (68/1+51/2)*17 (6)(3.25-0.8*8/5)/(6又4/1-3.5) 43+78-43 2.843-86+157 3.25x96x125 4.7500除125除5 5.72x53+41x24 6.2539-1999 7.75x37+19x25 8.38x82+38+38x17 9.975x38 10.454500除(25x45) 907*99+907(30+4)x25的简便计算该怎么做啊

    话题:13+44*124+31简便运算

    回答:13+44*124+31简便运算13+44*124+31=13+31+44*124=44+44*124=44x(1+124)=44x125=44x(100+25)=44x100+44x25=4400+25x(40+4)=4400+25x40+25x4=4400+1000+100=4400+1100=5500

    参考回答:展开全部13+44*124+31=(13+31)+44*124=44+44*124=(1+124)*44=125*44=5500

    话题:15*〔275÷(23+32)]怎样简便算

    回答:15*〔275÷(23+32)]=15x(11x25)÷55=15x5=75

    参考回答:baidu.jpg" target="_blank" title="点击查看大图" class="ikqb_img_alink" 神龙00摆尾 | 于2016-06-25 16:58

    话题:50简便计算(有)

    回答:1. 3÷7x49÷9-4÷3 2. 8÷9x15÷36+1÷27 3. 12* 5÷6-2÷9 *3 4. 8* 5÷4+1÷4 5. 6÷ 3÷8-3÷8 ÷6 6. 4÷7x5÷9+3÷7x5÷9 7. 5÷2 -( 3÷2+4÷5 ) 8. 7÷8+( 1÷8+1÷9 ) 9. 9x5÷6+5÷6 10. 3÷4x8÷9-1÷3 11. 7x5÷49+3÷14 12. 6 *( 1÷2+2÷3 ) 13. 8x4÷5+8x11÷5 14. 31x5÷6-5÷6 15. 9÷7-( 2÷7-10÷21 ) 16. 5÷9x18-14x2÷7 17. 4÷5x25÷16+2÷3x3÷4 18. 14x8÷7-5÷6x12÷15 19. 17÷32-3÷4x9÷24 20. 3x2÷9+1÷3 21. 5÷7x3÷25+3÷7 22. 3÷14 * 2÷3+1÷6 23. 1÷5x2÷3+5÷6 24. 9÷22+1÷11 ÷ 1÷2 25. 5÷3x11÷5+4÷3 26. 45x2÷3+1÷3x15 27. 7÷19+12÷19x5÷6 28. 1÷4+3÷4 ÷ 2÷3 29. 8÷7x21÷16+1÷2 30. 101x1÷5-1÷5x21 31. 50+160÷40 32. 120-144÷18+35 33. 347+45*2-4160÷52 34 (58+37)÷(64-9*5) 35. 95÷(64-45) 36. 178-145÷5*6+42 37. 812-700÷(9+31*11) 38. 85+14*(14+208÷26) 39.(284+16)*(512-8208÷18) 40. 120-36*4÷18+35 41.(58+37)÷(64-9*5) 42. (6.8-6.8*0.55)÷8.5 43. 0.12* 4.8÷0.12*4.8 44.(3.2*1.5+2.5)÷1.6 45. 6-1.6÷4 5.38+7.85-5.37 46. 7.2÷0.8-1.2*5 47. 6.5*(4.8-1.2*4) 48. 10.15-10.75*0.4-5.7 49. 5.8*(3.87-0.13)+4.2*3.74 50. 32.52-(6+9.728÷3.2)*2.5 备用*30.8÷[14-(9.85+1.07)] [60-(9.5+28.9)]÷0.18 2.881÷0.43-0.24*3.5 20*[(2.44-)÷0.4+0.15] 28-(3.4+1.25*2.4) 2.55*7.1+2.45*7.1 777*9+1111*3 0.8*〔15.5-(3.21+5.79)〕 (3+3.2*4)÷5 31.5*4÷(6+3) 0.64*25*7.8+2.2 2÷2.5+2.5÷2 194-64.8÷*0.9 36.72÷4.25*9.9 5180-705*6 24÷2.4-2.5*0.8 (4121+2389)÷7 671*15-974 469*12+1492 405*(3213-3189) 3.416÷(0.016*35) 0.8*[(10-6.76)÷1.2] 19.4*6.1*2.3 5.67*0.2-0.62 18.1*0.92+3.93 0.0430.24+0.875 0.4*0.7*0.25 0.75*102 100-56.23 0.78+5.436+1 4.07*0.86+9.12.5 1. 3/7 * 49/9 - 4/3 2. 8/9 * 15/36 + 1/27 3. 12* 5/6 – 2/9 *3 4. 8* 5/4 + 1/4 5. 6÷ 3/8 – 3/8 ÷6 6. 4/7 * 5/9 + 3/7 * 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 * 5/6 + 5/6 10. 3/4 * 8/9 - 1/3 11. 7 * 5/49 + 3/14 12. 6 *( 1/2 + 2/3 ) 13. 8 * 4/5 + 8 * 11/5 14. 31 * 5/6 – 5/6 15. 9/7 - ( 2/7 – 10/21 ) 16. 5/9 * 18 – 14 * 2/7 17. 4/5 * 25/16 + 2/3 * 3/4 18. 14 * 8/7 – 5/6 * 12/15 19. 17/32 – 3/4 * 9/24 20. 3 * 2/9 + 1/3 21. 5/7 * 3/25 + 3/7 22. 3/14 ** 2/3 + 1/6 23. 1/5 * 2/3 + 5/6 24. 9/22 + 1/11 ÷ 1/2 25. 5/3 * 11/5 + 4/3 26. 45 * 2/3 + 1/3 * 15 27. 7/19 + 12/19 * 5/6 28. 1/4 + 3/4 ÷ 2/3 29. 8/7 * 21/16 + 1/2 30. 101 * 1/5 – 1/5 * 21 没 算了用计算器就行

    参考回答:2.34*11-117*0.22 =(2.34*50)*(11÷50)-117*0.22 =117*0.22-117*0.22 =0 19.99*19.98-19.97*19.96 =19.99*(19.97+0.01)-19.97*19.96 =19.97*0.03+0.1999 =0.799 199.199*198-198.198*199 =199.199*198-198.198*(198+1) =199.199-198.198*198-198.198 =198.198-198.198 =0 18.9*178.178+0.49-17.8*17.8*189.189 =(17.8+1.1)*178.178+0.49-17.8*17.8*189.189 =17.8*(178.178-17.8*189.189)+1.1*178.178+0.49 =-56771.07436+195.9958+0.49 =-56574.58856 0.2*4.7+8.2*5.3=0.2*(5-0.3)+8.2*(5+0.3)=0.2*5-0.2*0.3+8.2*5+8.2*0.3=0.2*5+8.2*5+8.2*0.3-0.2*0.3=5*(0.2+8.2)+0.3*(8.2-0.2)=5*8.4+0.3*8=42+2.4=44.4( 3又7/11 + 1又12/13 ) ÷ ( 1又5/11 + 10/13 ) =(40/11+25/13)÷(16/11+10/13) =[(40x13+25x11)÷(11x13)]÷[(16x13+11x10)÷(11x13)] =(40x13+25x11)÷(16x13+11x10) =(520+275)÷(208+110) =795÷318 12.5x4.5+4.5x12.5+12.5 =12.5x(4.5+4.5+1) =12.5x10 =125 (1)3.4*7.8÷3.9 (2)85÷0.17÷5 (3)0.125*(2.4+0.8)*2.5 (4)9.9*9.9 (5)17.3*9.9+1.73 (6)8.5*96+34 (7)1.1+2.1+3.1+4.1+5.1 (8)99.9*999+99.9*2 (9)(4.5*7.5*4.8)÷(1.5*2.5*2.4) (10)3÷4*66+3÷4*34 (1)( 7.8/3.9)*3.4=2*3.4=6.8 (2) (85/5)/0.17=17/0.17=0.01 (3) (0.125*2.4+0.125*0.8)*2.5= (0.3+0.1)*2.5=0.4*2.5=1 (4) (10-0.1)*9.9=10*9.9-0.1*9.9=99-0.99=98.01 (5) 17.3*(10-0.1)+1.73=10*17.3-17.3*0.1+1.73=173 (6) 8.5*(100-4)+34=100*8.5-8.5*4+34=850 (7) (1+0.1)+(2+0.1)+(3+0.1)+(4+0.1)+(5+0.1)=(1+2+3+4+5)+5*0.1=15.5 (8) 99.9*(999+1+1)=99.9*(1000+1)=99.9*1000+99.9=99900+99.9=99999.9 (9)(3*1.5*3*2.5*2*2.4)/(1.5*2.5*2.4)=3*3*2=18 (10)(3/4)*(66+34)=(3/4)*100=75 66666667*66666667 =(70000000-3)*(70000000-3) =(70000000-3)^ 2 =70000000^2-2*70000000*3+3^2 =4900000000000000-420000000+9 =4899999580000009 ^是乘方的意思! X^2是平方的意思 X^3是立方的意思! 67.5÷0.125+32.5*8 =67.5*8+32.5*8 =(67.5+32.5)*8 =100*8 =800 75.43÷0.01-25.43*100 =75.43*100-25.43*100 =(75.43-25.43)*100 =5000 6.3-(2.1÷1.15) =6.3-2 =4.3(30+4)x25的简便计算该怎么做啊

    话题:50简便计算(有)

    回答:1. 3÷7x49÷9-4÷3 2. 8÷9x15÷36+1÷27 3. 12* 5÷6-2÷9 *3 4. 8* 5÷4+1÷4 5. 6÷ 3÷8-3÷8 ÷6 6. 4÷7x5÷9+3÷7x5÷9 7. 5÷2 -( 3÷2+4÷5 ) 8. 7÷8+( 1÷8+1÷9 ) 9. 9x5÷6+5÷6 10. 3÷4x8÷9-1÷3 11. 7x5÷49+3÷14 12. 6 *( 1÷2+2÷3 ) 13. 8x4÷5+8x11÷

    参考回答:展开全部 1. 3÷7x49÷9-4÷3 2. 8÷9x15÷36+1÷27 3. 12* 5÷6-2÷9 *3 4. 8* 5÷4+1÷4 5. 6÷ 3÷8-3÷8 ÷6 6. 4÷7x5÷9+3÷7x5÷9 7. 5÷2 -( 3÷2+4÷5 ) 8. 7÷8+( 1÷8+1÷9 ) 9. 9x5÷6+5÷6 10. 3÷4x8÷9-1÷3 11. 7x5÷49+3÷14 12. 6 *( 1÷2+2÷3 ) 13. 8x4÷5+8x11÷5 14. 31x5÷6-5÷6 15. 9÷7-( 2÷7-10÷21 ) 16. 5÷9x18-14x2÷7 17. 4÷5x25÷16+2÷3x3÷4 18. 14x8÷7-5÷6x12÷15 19. 17÷32-3÷4x9÷24 20. 3x2÷9+1÷3 21. 5÷7x3÷25+3÷7 22. 3÷14 * 2÷3+1÷6 23. 1÷5x2÷3+5÷6 24. 9÷22+1÷11 ÷ 1÷2 25. 5÷3x11÷5+4÷3 26. 45x2÷3+1÷3x15 27. 7÷19+12÷19x5÷6 28. 1÷4+3÷4 ÷ 2÷3 29. 8÷7x21÷16+1÷2 30. 101x1÷5-1÷5x21 31. 50+160÷40 32. 120-144÷18+35 33. 347+45*2-4160÷52 34 (58+37)÷(64-9*5) 35. 95÷(64-45) 36. 178-145÷5*6+42 37. 812-700÷(9+31*11) 38. 85+14*(14+208÷26) 39.(284+16)*(512-8208÷18) 40. 120-36*4÷18+35 41.(58+37)÷(64-9*5) 42. (6.8-6.8*0.55)÷8.5 43. 0.12* 4.8÷0.12*4.8 44.(3.2*1.5+2.5)÷1.6 45. 6-1.6÷4 5.38+7.85-5.37 46. 7.2÷0.8-1.2*5 47. 6.5*(4.8-1.2*4) 48. 10.15-10.75*0.4-5.7 49. 5.8*(3.87-0.13)+4.2*3.74 50. 32.52-(6+9.728÷3.2)*2.5 备用*30.8÷[14-(9.85+1.07)] [60-(9.5+28.9)]÷0.18 2.881÷0.43-0.24*3.5 20*[(2.44-)÷0.4+0.15] 28-(3.4+1.25*2.4) 2.55*7.1+2.45*7.1 777*9+1111*3 0.8*〔15.5-(3.21+5.79)〕 (3+3.2*4)÷5 31.5*4÷(6+3) 0.64*25*7.8+2.2 2÷2.5+2.5÷2 194-64.8÷*0.9 36.72÷4.25*9.9 5180-705*6 24÷2.4-2.5*0.8 (4121+2389)÷7 671*15-974 469*12+1492 405*(3213-3189) 3.416÷(0.016*35) 0.8*[(10-6.76)÷1.2] 19.4*6.1*2.3 5.67*0.2-0.62 18.1*0.92+3.93 0.0430.24+0.875 0.4*0.7*0.25 0.75*102 100-56.23 0.78+5.436+1 4.07*0.86+9.12.5 1. 3/7 * 49/9 - 4/3 2. 8/9 * 15/36 + 1/27 3. 12* 5/6 – 2/9 *3 4. 8* 5/4 + 1/4 5. 6÷ 3/8 – 3/8 ÷6 6. 4/7 * 5/9 + 3/7 * 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 * 5/6 + 5/6 10. 3/4 * 8/9 - 1/3 11. 7 * 5/49 + 3/14 12. 6 *( 1/2 + 2/3 ) 13. 8 * 4/5 + 8 * 11/5 14. 31 * 5/6 – 5/6 15. 9/7 - ( 2/7 – 10/21 ) 16. 5/9 * 18 – 14 * 2/7 17. 4/5 * 25/16 + 2/3 * 3/4 18. 14 * 8/7 – 5/6 * 12/15 19. 17/32 – 3/4 * 9/24 20. 3 * 2/9 + 1/3 21. 5/7 * 3/25 + 3/7 22. 3/14 ** 2/3 + 1/6 23. 1/5 * 2/3 + 5/6 24. 9/22 + 1/11 ÷ 1/2 25. 5/3 * 11/5 + 4/3 26. 45 * 2/3 + 1/3 * 15 27. 7/19 + 12/19 * 5/6 28. 1/4 + 3/4 ÷ 2/3 29. 8/7 * 21/16 + 1/2 30. 101 * 1/5 – 1/5 * 21 没 算了用计算器就行

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