0.279*343+0.657*279用简便计算
问题描述：
0.279*343+0.657*279用简便计算
答
解
0.279*343+0.657*279
=0.279×343+657×0.279
=0.279×(343+657)
=0.279×1000
=279
答
0.279*343+0.657*279
=0.279*343+0.657*0.279*1000
=0.279x(343+0.657x1000)
=0.279x1000
=279
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