15.6*21+17.6*79简便计算?
2个回答
展开全部
15.6x21+17.6x79
=15.6x21+(15.6+2)x79
=15.6x21+15.6x79+2x79
=15.6x(21+79)+2x79
=15.6x100+158
=1560+158
=1718
=15.6x21+(15.6+2)x79
=15.6x21+15.6x79+2x79
=15.6x(21+79)+2x79
=15.6x100+158
=1560+158
=1718
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展开全部
15.6×21+17.6×79
=15.6×21+(15.6+2)×79
=15.6×21+15.6×79+2×79
=15.6×(21+79)+158
=15.6×100+158
=1560+158
=1718
=15.6×21+(15.6+2)×79
=15.6×21+15.6×79+2×79
=15.6×(21+79)+158
=15.6×100+158
=1560+158
=1718
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