1.5x0.5,2.02X8.5简便运算?
2个回答
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1.5×0.5
=(1+0.5)×0.5
=1×0.5+0.5×0.5
=0.5+0.25
=0.75
2.02×8.5
=(2+0.02)×8.5
=2×8.5+0.02×8.5
=17+0.017
=17.017
=(1+0.5)×0.5
=1×0.5+0.5×0.5
=0.5+0.25
=0.75
2.02×8.5
=(2+0.02)×8.5
=2×8.5+0.02×8.5
=17+0.017
=17.017
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