3.5×4+6.5×0.25简便计算?
2个回答
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原式=3.5x4+6.5x0.25
=(2.5+1)x4+6.5x0.25
=2.5x4+4+(4+2.5)x0.25
=10+4+4x0.25+2.5x0.25
=14+1+(2+0.5)x0.25
=15+2x0.25+0.5x0.25
=15+0.5+0.125
=15+0.625
=15.625
=(2.5+1)x4+6.5x0.25
=2.5x4+4+(4+2.5)x0.25
=10+4+4x0.25+2.5x0.25
=14+1+(2+0.5)x0.25
=15+2x0.25+0.5x0.25
=15+0.5+0.125
=15+0.625
=15.625
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