3.7*0.15 2.1*0.45 是怎么用简便方法算
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把0.45变成0.15*3
3.7*0.15+2.1*0.45
=3.7*0.15+2.1*0.15*3
=3.7*0.15+2.1*3*0.15
=3.7*0.15+6.3*0.15
=(3.7+6.3)*0.15
=10*0.15
=1.5
3.7*0.15+2.1*0.45
=3.7*0.15+2.1*0.15*3
=3.7*0.15+2.1*3*0.15
=3.7*0.15+6.3*0.15
=(3.7+6.3)*0.15
=10*0.15
=1.5
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3.7*0.15
=(4-0.3)*0.15
=4*0.15-0.3*0.15
=0.6-0.045
=0.555
2.1*0.45
=2*0.45+0.1*0.45
=0.9+0.045
=0.945
=(4-0.3)*0.15
=4*0.15-0.3*0.15
=0.6-0.045
=0.555
2.1*0.45
=2*0.45+0.1*0.45
=0.9+0.045
=0.945
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