7.9*2.5+2.2*2.5-0.25的简便算法
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7.9*2.5+2.2*2.5-0.25的简便算法7.9*2.5+2.2*2.5-0.25的简便算法7.9*2.5+2.2*2.5-0.25的简便算法7.9×2.5+2.2×2.5-0.25=7.9×
7.9*2.5+2.2*2.5-0.25的简便算法
7.9*2.5+2.2*2.5-0.25的简便算法
7.9*2.5+2.2*2.5-0.25的简便算法
7.9×2.5+2.2×2.5-0.25
=7.9×2.5+2.2×2.5-2.5×0.1
=(7.9+2.2-0.1)×2.5
=10×2.5
=25
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2.5: