0.96乘6.9简便算法?
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把0.96看作是1-0.04,于是原式就是6.9-0.276=6.624
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=(1-0.04)×6.9
=1×6.9-0.04×6.9
=6.9-0.04×(7-0.1)
=6.9-0.04×7+0.04×0.1
=6.9-0.28+0.004
=6.9-(0.3-0.02)+0.004
=6.9-0.3+0.02+0.004
=6.624
=1×6.9-0.04×6.9
=6.9-0.04×(7-0.1)
=6.9-0.04×7+0.04×0.1
=6.9-0.28+0.004
=6.9-(0.3-0.02)+0.004
=6.9-0.3+0.02+0.004
=6.624
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