
1个回答
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原式=0.25×0.9 + (8 + 0.25)×0.1
=0.25×0.9 + 8×0.1 + 0.25×0.1
=0.25×(0.9 + 0.1) + 0.8
=0.25×1 + 0.8
=0.25 + 0.8
=1.05
=0.25×0.9 + 8×0.1 + 0.25×0.1
=0.25×(0.9 + 0.1) + 0.8
=0.25×1 + 0.8
=0.25 + 0.8
=1.05
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