简便计算2.5x1.2+2.5的过程?
2个回答
2021-07-21
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2.5×1.2+2.5
=2.5×(0.8+0.4)+2.5
=2.5×0.8+2.5×0.4+2.5
=2+1+2.5
=5.5
=2.5×(0.8+0.4)+2.5
=2.5×0.8+2.5×0.4+2.5
=2+1+2.5
=5.5
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