1.3+5.7×0.4简便方法?
3个回答
展开全部
1.3+5.7*0.4
=1.3+(1.3*4+0.5)*0.4
=1.3+1.3*1.6+0.5*0.4
=1.3*2.6+0.2
=1.3*1.3*2+0.2
=1.69*2+0.1*2
=2*(1.69+0.1)
=2*1.79
=2*1.8-2*0.01
=3.6-0.02
=3.58
=1.3+(1.3*4+0.5)*0.4
=1.3+1.3*1.6+0.5*0.4
=1.3*2.6+0.2
=1.3*1.3*2+0.2
=1.69*2+0.1*2
=2*(1.69+0.1)
=2*1.79
=2*1.8-2*0.01
=3.6-0.02
=3.58
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展开全部
1.3+5.7*0.4
=1.3+(5+0.7)*0.4
=1.3+2+0.28
=3.58
=1.3+(5+0.7)*0.4
=1.3+2+0.28
=3.58
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你对这个回答的评价是?
展开全部
1.3+5.7x0.4
=1.3+(5十0.7)ⅹ0.4
=1.3+5x0.4+0.7x0.4
=1.3+2+0.28
=3.3+0.28
=3.58
=1.3+(5十0.7)ⅹ0.4
=1.3+5x0.4+0.7x0.4
=1.3+2+0.28
=3.3+0.28
=3.58
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