7.58+5.39-8.27简便算法

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7.58+5.39-8.27简便算法7.58+5.39-8.27简便算法7.58+5.39-8.27简便算法7.58+5.39-8.27=7.58+0.02+5.39+0.01-8.27-0.03=7

7.58+5.39-8.27简便算法
7.58+5.39-8.27
简便算法

7.58+5.39-8.27简便算法
7.58+5.39-8.27
=7.58+0.02+5.39+0.01-8.27-0.03
=7.6+5.4-8.3
=13-8.3
=4.7