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15道简便计算及答案?

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

7 8.3×(6.3+3.7)

=8.3×10

=83

8 1.24+0.78+8.76

=(1.24+8.76)+0.78

=10+0.78

=10.78

9 933-157-43

=933-(157+43)

=933-200

=733

10 4821-998

=4821-1000+2

=3823

匿名回答于2021-04-10 20:06:13


15道简便运算及答案?125乘以8乘以60等于1000乘以60,等于60000、125乘以80乘以400,等于10000乘以400,等于4000000、25乘以4乘以657,等于100乘以657等于65700、25乘以8再乘以5,等于200乘以5,等于1000、200乘以50在乘以100,等于10000乘以100等于1000000。

匿名回答于2021-10-05 04:57:42


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