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第112页

信息发布者：

25

9.38

D

D

C

A

D

B

=753×0.23+753×0.23+753×0.54

=753×(0.23+0.23+0.54)

=753

=0.1÷0.2×0.3÷0.3×0.4÷0.4×0.5÷0.5×0.6÷0.6

×0.7÷0.7×0.8

=0.1÷0.2×0.8

=0.4

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