0.79×0.46×7.9×0.24+1.4×0.079的简便方法？
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0.79×0.46+7.9×0.24+1.4×0.079
=7.9×0.046+7.9×0.24+7.9×0.014
=7.9×(0.046+0.014+0.24)
=7.9×(0.06+0.24)
=7.9×0.3
=8×0.3-0.1×0.3
=2.4-0.03
=2.37
=7.9×0.046+7.9×0.24+7.9×0.014
=7.9×(0.046+0.014+0.24)
=7.9×(0.06+0.24)
=7.9×0.3
=8×0.3-0.1×0.3
=2.4-0.03
=2.37
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