2.8x0.42+28x0.068-0.28简便?
3个回答
展开全部
2.8*.042+28*0.068-0.28
=2.8*0.42+2.8*0.68-2.8*0.1
=2.8(0.42+0.68-0.1)
=2.8*1
=2.8
=2.8*0.42+2.8*0.68-2.8*0.1
=2.8(0.42+0.68-0.1)
=2.8*1
=2.8
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展开全部
2.8x0.42+28x0.068-0.28
=0.28x4.2+0.28x6.8-0.28
=0.28x(4.2+6.8-1)
=0.28x(11-1)
=0.28x10
=2.8
=0.28x4.2+0.28x6.8-0.28
=0.28x(4.2+6.8-1)
=0.28x(11-1)
=0.28x10
=2.8
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