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简单 210÷7÷6 1035-(497+235) 210÷(7×6) 1100÷25 2700÷25÷4 246-78+54 中等 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 高难度 199999+19999+1999+199+19 999×718+333×666
用简便方法计算. 1、368+2649+1351 2、 87+101+113 3、24+127+476+573 4、400-273-127 5、327+(96-127) 6、72×98 7、999+99+9 8、442-103-142 9、67×5×2 10、25×(78×4) 11、72×125 12、9000÷125÷8 13、400÷25 14、25×36 15、103×27 16、76×102 17、3600÷25÷4 18、99×35 19、(25+12)×4 20、56×27+27×44 21、56×99+56 22、125×25×8×4 23、25×32×125 24、125×64 (1)(78+61)+39 (2)700-82-18 (3)348+163+242+410+537 (4)125×47-47×25 (5)201×316 (6)374-205+226-95 (7)3000-999 (8)997×7+21 (9)87×470+870×53 (10)(55+55+55+55×5)×125 (11)125×(8+40)×25 (12)99+49×99 (13)265×97+4×265 (14)454+999×999+545 (15)9999×36+6666×3×32 (16)124×38+65×124+76×110-76×7 (17)62×4+44×5+5×18 (18)3400-62×34-38×20-38×14 (19)1992×19911991-1991×19901990
从第二个开始为4X3^(n-2),所以第100个是4X3^98
1. 0.4×125×25×0.8 =(0.4×25)×(125×0.8)=10×100=1000 2. 1.25×(8+10)=1.25×8+1.25×10 =10+12.5=22.5 3.9123-(123+8.8)=9123-123-8.8=9000-8.8=8991.2 4.1.24×8.3+8.3×1.76 =8.3×(1.24+1.76) =8.3×3=24.9 5.9999×1001 =9999×(1000+1) =9999×1000+9999×1 =10008999 6. 14.8×6.3-6.3×6.5+8.3×3.7 =(14.8-6.5)×6.3+8.3×3.7 =8.3×6.3+8.3×3.7 =8.3×(6.3+3.7) =8.3×10 =83 7. 1.24+0.78+8.76 =(1.24+8.76)+0.78 =10+0.78 =10.78 8. 933-157-43 =933-(157+43) =933-200 =733 9. 4821-998 =4821-1000+22=3823 10. 32×125×25 =4×8×125×25 =(4×25)×(8×125) =100×1000 =100000 9048÷26 =(2600+2600+2600+1248)÷26 =2600÷26+2600÷26+2600÷26+1248÷26 =100+100+100+48 =348 11. 2881÷ 43 =(1290+1591)÷ 43 =1290÷43+1591÷43 =30+37 =67 3.2×42.3×3.75-12.5×0.423×16 =3.2×42.3×3.75-1.25×42.3×1.6 =42.3×(3.2×3.75-1.25×1.6) =42.3×(4×0.8×3.75-1.25×4×0.4) =42.3×(4×0.4×2×3.75-1.25×4×0.4) =42.3×(4x0.4x7.5-1.25x4x0.4) =42.3×[4×0.4×(7.5-1.25)] =42.3×[4×0.4×6.25] =42.3×(4×2.5) =423 12. 1.8+18÷1.5-0.5×0.3 =1.8+12-0.15=13.8-0.15 =13.65 13. 6.5×8+3.5×8-47 =52+28-47 =80-47 =33 (80-9.8)×5分之2-1.32 =70.2X2/5-1.32=28.08-1.32 =26.76 14. 8×7分之4÷[1÷(3.2-2.95)] =8×4/7÷[1÷0.25]=8×4/7÷4 =8/7 15. 2700×(506-499)÷900 =2700×7÷900 =18900÷900 =21 16. 33.02-(148.4-90.85)÷2.5=33.02-57.55÷2.3=33.02-23.02=10 17. (1÷1-1)÷5.1 =(1-1)÷5.1 =0÷5.1 =0 18. 18.1+(3-0.299÷0.23)×1=18.1+1.7×1 =18.1+1.7 =19.8 19. 9000÷72×(1.25×0.7×8)=9000÷72×7=125×7=875 20. 61-(1.25+2.5×0.7)=61-3=58 21. [(10-0.8)+9.85]-2÷0.125=19.05-2÷0.125=19.05-16=13.05 22. 5.4÷1.8+240×1.5=3+360=363 23. 9000÷72×(1.25×0.7×8)=9000÷72×7=125×7=875 24. 61-(1.25+2.5×0.7)=61-3=58 25. [(10-0.8)+9.85]-2÷0.125=19.05-2÷0.125=19.05-16=3.05 26. 408-12×24= 408 - 288= 120 27. (46+28)×60= 74 x 60= 4440 28. 42×50-17 = 2100- 17 = 2083 29. 32+105÷5 = 32 + 21= 53 30. 420×(327-238) = 420 x 89 = 37380 31. (4121+2389)÷7 = 6510 ÷7 = 930 32. 3.416÷(0.016×35) = 3.416 ÷0.56 = 6.1 33. 0.8×[(10-6.76)÷1.2] = 0.8 x(3.24÷1.2) = 0.8 x 2.7 = 2.16 34. 5.67×0.2-0.62 = 1.134-0.62 = 0.514 35.0.4×0.7×0.25 = 0.4 x 0.2 5 x 0.7 = 0.1 x 0.7 = 0.07 36. 0.78+5.436+1 = 6.216 +1 = 7.216 37. 30.8÷[14-(9.85+1.07)] = 30.8 ÷ (14 - 10.92) = 30.8÷3.08 = 10 38. [60-(9.5+28.9)]÷0.18 = (60- 38.4)÷0.18 = 21.6 ÷0.18 = 120 39. 2.881÷0.43-0.24×3.5 = 6.7 - 0.24 x3.5 = 6.7 - 0.84 = 5.86 40. 20×[(2.44-1.8)÷0.4+0.15] = 20x (0.64 ÷0.4 +0.15)= 20x(1.6 +0.15) = 20 x1.75 = 35 41. 28-(3.4+1.25×2.4) = 28 - (3.4 + 3) = 28 - 6.4 = 21.6 42. 2.55×7.1+2.45×7.1 = (2.55 + 2.45) x7.1 = 5 x7.1=35.5 43. 0.8×〔15.5-(3.21+5.79)〕 = 0.8 x (15.5 - 9) = 0.8 x 6.5 = 5.2 44.(31.8+3.2×4)÷5 = (31.8 + 12.8)÷5 = 44.6÷5 = 8.92 45. 31.5×4÷(6+3) = 126 ÷ 9 = 14 46. 2÷2.5+2.5÷2 = 0.8 + 1.25 =2.05 47. 194-64.8÷1.8×0.9 = 194 -36 x0.9 = 194-32.4 = 161.65180-705×6 = 5180 - 4230=950 48. 24÷2.4-2.5×0.8 =10 -2=8 49. 405×(3213-3189) =405x24 = 9720 59. 125×(97-81) =125x16 =2000 60. 6942+480÷3 = 6942 + 160 = 6782 61. 20+80÷4-20 = 20 + 20 -20 = 40 -20 = 20 62. 100÷(32-30)×0 = 100 ÷2 x0= 50 x0 = 0 63. 25×4-12×5 = 100 - 60 = 40 64. 70×〔(42-42)÷18〕=70 x (0÷18) = 70x0 = 0 65. 75×65+75×35 = 75 x (65 +35) = 75x100 = 7500 66. 6-1.6÷4= 6- 0.4 = 5.6 67. 5.38+7.85-5.37= 13.23 - 5.37=7.86 68. 7.2÷0.8-1.2×5=9 - 6 =3 69. 6-1.19×3-0.43= 6-3.57 - 0.43 = 6- (3.57 + 0.43) = 6-4 = 2 70. 6.5×(4.8-1.2×4)= 6.5 x(4.8 - 4.8 )=6.5 x0 = 0 71. 0.68×1.9+0.32×1.9 = (0.68 + 0.32) x1.9 = 1 x 1.9 = 1.9 72. 10.15-10.75×0.4-5.7 = 10.15 - 4.3 - 5.7 = 10.15 -(4.3 + 5.7)=10.15 - 10 =0.15 73. 5.8×(3.87-0.13)+4.2×3.74 = 5.8 x 3.74 +4.2 x 3.74 = (5.8 +4.2)x3.74 = 10 x 3.74 = 37.4 74. 32.52-(6+9.728÷3.2)×2.5 = 32.52 - (6+3.04)x2.5 = 32.52 - 9.02 x 2.5 = 32.52 -22.55 = 9.97 75.(136+64)×(65-345÷23)= 200x(65-15) = 200x 50=10000 76. 0.4×125×25×0.8 =(0.4×25)×(125×0.8)=10×100=1000 77. 1.25×(8+10) =1.25×8+1.25×10=10+12.5=22.5 78. 9123-(123+8.8) =9123-123-8.8=9000-8.8=8991.2 79. 1.24×8.3+8.3×1.76 =8.3×(1.24+1.76)=8.3×3=24.9 80. 9999×1001 =9999×(1000+1)=9999×1000+9999×1 =10008999 81. 14.8×6.3-6.3×6.5+8.3×3.7 =(14.8-6.5)×6.3+8.3×3.7=8.3×6.3+8.3×3.7 82. 8.3×(6.3+3.7) =8.3×10 =83 83. 1.24+0.78+8.76 =(1.24+8.76)+0.78 =10+0.78 =10.78 84. 933-157-43 =933-(157+43)=933-200=733 85. 4821-998 =4821-1000+2=3823 86. I32×125×25 =4×8×125×25 =(4×25)×(8×125)=100×1000 =100000 87. 9048÷268 =(2600+2600+2600+1248)÷26 =2600÷26+2600÷26+2600÷26+1248÷269 =100+100+100+48 =348 88. 2881÷ 43 =(1290+1591)÷ 434=1290÷43+1591÷43=30+37 89. 1.8+18÷1.5-0.5×0.3 =1.8+12-0.15=13.8-0.15=13.65 90. 6.5×8+3.5×8-47 =52+28-47=80-47 91. (80-9.8)×5分之2-1.32 =70.2X2/5-1.32=28.08-1.32=26.76 92. 8×7分之4÷[1÷(3.2-2.95)]=8×4/7÷[1÷0.25]=8×4/7÷4=8/7 93. 2700×(506-499)÷900 =2700×7÷900 =18900÷900 =21 94. 33.02-(148.4-90.85)÷2.5=33.02-57.55÷2.5=33.02-23.02 =10 95. (1÷1-1)÷5.1 =(1-1)÷5.1 =0÷5.1 =0 96. 18.1+(3-0.299÷0.23)×1=18.1+1.7×1 =18.1+1.7 =19.8 97. 4.1/27+505/2727+131313/272727 =1/27+5*101/(27*101)+13*10101/(27*10101) =1/27+5/27+13/27=19/27 98. 6.5×8+3.5×8-47 =52+28-47=80-47 99. (80-9.8)×5分之2-1.32 =70.2X2/5-1.32=28.08-1.32=26.76 100. 1.8+18÷1.5-0.5×0.3 =1.8+12-0.15=13.8-0.15=13.65 延展回答 脱式计算即递等式计算,把计算过程完整写出来的运算,也就是脱离横式的计算。 在计算混合运算时,通常是一步计算一个算式(逐步计算,等号不能写在原式上),要写出每一步的过程。一般来说,等号要往前,不与第一行对齐。也就是离开原式计算。 (脱字念tuo)主要掌握的是记住要先算乘、除法,后算加、减法。在乘除法连续计算时中,要按从左往右的顺序依次计算。遇到括号,要首先计算括号内部。 在脱式过程中要按运算顺序划出运算顺序线,还要做到"三核对",一要核对从书上把题抄到作业本上数字、符号是否抄对。二要核对从横式抄到草稿竖式的数字、符号是否抄对。三要核对把草稿竖式上的得数,抄到横式上是否抄对,小数点是否点对地方,有无遗漏。