47.5×2.3+3.4×52.5+7.5×1.1
=47.5×2.3+2.3×52.5+1.1×52.5+7.5×1.1
=2.3x(47.5+52.5)+1.1×(52.5+7.5)
=230+66
=296
47.5×2.3+3.4×52.5+7.5×1.1减便算法过程
1个回答
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