7.9×0.64+0.79×3.
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7.9×0.64+0.79×3.7.9×0.64+0.79×3.7.9×0.64+0.79×3.简便算法：原式=0.79×6.4+0.79×3.6=0.79×（6.4+3.6）=0.79×10=7.9
7.9×0.64+0.79×3.
7.9×0.64+0.79×3.
7.9×0.64+0.79×3.
简便算法：原式=0.79×6.4+0.79×3.6
=0.79×（6.4+3.6）
=0.79×10
=7.9
7.9×0.64+0.79×3.
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