零点七五乘零点五加零点七五乘一点六加零点五乖一点六乘二用简便方法...
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0.75×0.5+0.75×1.6+0.5×1.62
=0.75×（0.5+1.6）+0.5×1.62
=0.75×2.1+0.5×1.62
=1.575+0.81
=2.385
