0.32+0.48×8.5的简便方法
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0.32+0.48×8.5
=0.08+0.24+0.48×8.5
=0.08+0.48*(8.5+0.5)
=0.08+0.48*9
=0.08+0.48*10-0.48
=4.8-0.4
=4.4
=0.08+0.24+0.48×8.5
=0.08+0.48*(8.5+0.5)
=0.08+0.48*9
=0.08+0.48*10-0.48
=4.8-0.4
=4.4
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