3.5乘8.9加2.1乘3.8减3.8用简便运算
2016-11-04 · 知道合伙人教育行家
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3.5x8.9+2.1x3.8-3.8
=3.5x8.9+(2.1-1)x3.8
=3.5x8.9+1.1x(3.5+0.3)
=3.5x8.9+1.1x3.5+1.1x0.3
=3.5x(8.9+1.1)+0.33
=3.5x10+0.33
=35+0.33
=35.33
=3.5x8.9+(2.1-1)x3.8
=3.5x8.9+1.1x(3.5+0.3)
=3.5x8.9+1.1x3.5+1.1x0.3
=3.5x(8.9+1.1)+0.33
=3.5x10+0.33
=35+0.33
=35.33
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3.5*8.9+2.1*3.8-3.8
=3.5*8.9+3.8*(2.1-1)
=3.5*8.9+3.8*1.1
=3.5*8.9+3.5*1.1+0.3*1.1
=3.5*(8.9+1.1)+0.33
=3.5*10+0.33
=35+0.33
=35.33
=3.5*8.9+3.8*(2.1-1)
=3.5*8.9+3.8*1.1
=3.5*8.9+3.5*1.1+0.3*1.1
=3.5*(8.9+1.1)+0.33
=3.5*10+0.33
=35+0.33
=35.33
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2016-11-04
展开全部
3.5*8.9+2.1*3.8-3.8=3.5*8.9+(2.1-1)*3.8=3.5*8.9+1.1*3.8=3.5*8.9+1.1*(3.5+0.3)=3.5*(8.9+1.1)+1.1*0.3=3.5*10+0.33=10.33
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