3.1×4.5+55×0.31 简算
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3.1×4.5+55×0.31简算3.1×4.5+55×0.31简算3.1×4.5+55×0.31简算=3.1×4.5+5.5×3.1=3.1×(44.5+5.5)=3.1×10=313.1×4.5+
3.1×4.5+55×0.31 简算
3.1×4.5+55×0.31 简算
3.1×4.5+55×0.31 简算
=3.1×4.5+5.5×3.1
=3.1×(44.5+5.5)
=3.1×10
=31
3.1×4.5+55×0.31
=3.1x4.5+5.5x3.1
=3.1x(4.5+5.5)
=3.1x10
=31
3.1×4.5+55×0.31
=3.1×4.5+5.5×3.1
=3.1×(4.5+5.5)
=31
0.31*45+0.31*55
=0.31*(45+55)
=0.31*100
=31
3.1*(4.5+5.5)=31
晕,这是上课没认真的小学生吗?
碰到这种题首先要观察,发现3.1和0.31相差十倍,则可以换成相同的
3.1x4.5+55X0.31
=3.1x4.5+5.5x3.1
=3.1x(4.5+5.5)
=3.1x10
=31
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