3.31×2.5-0.31÷4简便计算?
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3.31×2.5-0.31÷4
=3.31×2.5-0.31×0.25
=3.31×2.5-0.031×2.5
=(3.31-0.031)×2.5
=8.1975
=3.31×2.5-0.31×0.25
=3.31×2.5-0.031×2.5
=(3.31-0.031)×2.5
=8.1975
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3.31x2.5-0.31➗4
=(3+0.31)x5/2-0.31/4
=15/2+ 0.31x10/4-0.31/4
=15/2+0.31x9/4
=7.5+2.79/4
=7.5+0.6975
=8.1975
或原式=3.31x10/4-0.31/4
=(33.1-0.31)/4=32.79/4=8.1975
=(3+0.31)x5/2-0.31/4
=15/2+ 0.31x10/4-0.31/4
=15/2+0.31x9/4
=7.5+2.79/4
=7.5+0.6975
=8.1975
或原式=3.31x10/4-0.31/4
=(33.1-0.31)/4=32.79/4=8.1975
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