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第31页

信息发布者：

4.2

0.64

0.7

5.2

490

6

0.3

37

8

0.06

0

64

=0.144

≈0.85

=0.0108

=0.25

验算：

=6.57×(99+1)

=6.57×100

=657

=(3.9+6.1)+(0.56+0.44)

=10+1

=11

=1.25×8×0.4×2.5

=(1.25×8)×(0.4×2.5)

=10×1

=10

=3.75×0.5+6.25×0.5

=(3.75+6.25)×0.5

=10×0.5

=5

=7.8×(10-0.1)

=7.8×10-7.8×0.1

=78-0.78

=77.22

=0.81÷[0.9×0.6]

=0.81÷0.9÷0.6

=0.9÷0.6

=1.5

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