用简便方法计算:(1)3.7*0.15+2.1*0.45 (2)3.75*4.23*36—125*0.423*2.8
2个回答
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(1)3.7*0.15+2.1*0.45
=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
(2)3.75*4.23*36—125*0.423*2.8
=1.25*3*4.23*36- 1.25*4.23*28
=1.25*4.23*108 - 1.25*4.23*28
=1.25*4.23*(108-28)
=1.25*4.23*80
=1.25*80*4.23
=100*4.23
=423
=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
(2)3.75*4.23*36—125*0.423*2.8
=1.25*3*4.23*36- 1.25*4.23*28
=1.25*4.23*108 - 1.25*4.23*28
=1.25*4.23*(108-28)
=1.25*4.23*80
=1.25*80*4.23
=100*4.23
=423
2012-09-24
展开全部
3.7*0.15+2.1*3*0.15=3.7*0.15+6.3*0.15=(3.7+6.3)*0.15=1.5
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