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6.2x2.1-2.1x2.8-2.8x0.15怎样简算

题目详情
6.2x2.1-2.1x2.8-2.8x0.15怎样简算
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答案和解析
6.2x2.1-2.1x2.8-2.8x0.15
=0.7×(3×6.2)-0.7×(3×2.8)-0.7×(4×0.15)
=0.7×18.6-0.7×8.4-0.7×0.6
=0.7×[18.6-(8.4+0.6)]
=0.7×9.6
=6.72