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第88页

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7.2

0.2

1

1

1.7

1.2

0.8

5.7

7

=2.52

=1.62

=2.55

=7

≈0.20

$=1.5\dot {3}$

=(0.25×4)×7.87

=1×7.87

=7.87

=2.6×(10+0.2)

=2.6×10+2.6×0.2

=26+0.52

=26.52

=8.75×(101-1)

=8.75×100

=875

=(100+1)×0.45

=100×0.45+1×0.45

=45+0.45

=45.45

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