Question

小学数学题 解答要详细

简便计算 (过程）

5X64X25X125X93
（1-三分之一-五分之二-四分之一）X60
26.4X25-2.6X250
48.2X0.059+0.41X4.82
二分之一+六分之一+十二分之一+二十分之一.........+九千九百分之一
六分之五-十二分之七+二十分之九-三十分之十一+四十二分之十三-五十六分之十五+七十二分之十七
347X69+653X31+306X19
1.12X67.875+125X6.7875+1250X0.053375
9988+5622
9999X9999+19999
49X46-49X32-49X4

Answer 1

5X64X25X125X93
= 5X2×4×8X25X125X93
=(5X2)×(4X25)×(8X125)X93
=93X10×100×1000
=93000000

（1-1/3-2/5-1/4）X60

=1×60-1/3×60-2/5×60-1/4×60
=60-20-24-15
=1

26.4X25-2.6X250
=26.4X25-26X25
=（26.4-26）X25
=0.4X25
=10

48.2X0.059+0.41X4.82
=48.2X0.059+0.041X48.2
=48.2X（0.059+0.041）
=48.2X0.1
=4.82

二分之一+六分之一+十二分之一+二十分之一.........+九千九百分之一

=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+..........+1/99-1/100
=1-1/100
=99/100

六分之五-十二分之七+二十分之九-三十分之十一+四十二分之十三-五十六分之十五+七十二分之十七
=1/2+1/3-(1/3+1/4)+(1/4+1/5）-（1/5+1/6）+(1/6+1/7)-(1/7+1/8)+(1/8+1/9)
=1/2+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8+1/8+1/9
=1/2+1/9
=11/18

347X69+653X31+306X19
=347×50+347×19+306×19+653×31
=347×50+（347+306）×19+653×31
=347×50+653×19+653×31
=347×50+653×（19+31）
=347×50+653×50
=（347+653）×50
=1000×50
=50000

1.12X67.875+125X6.7875+1250X0.053375 【题目有问题】

1.25x67.875+125x6.7875+1250x0.053375
=1.25x67.875+1.25x678.75+1.25x53.375
=1.25×（67.875+678.75+53.375）
=1.25×800
=1000

9988+5622
=9988+12+5610
=10000+5610
=15610

9999X9999+19999

=9999X9999+9999+10000
=9999X（9999+1）+10000
=9999X10000+10000
=（9999+1）×10000
=100000000

49X46-49X32-49X4
=49X（46-32-4）
=49X10
=490