157.27+357.27+557.27+757.27+957.27怎么巧算?10.1×9.9怎么巧算?
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157.27+357.27+557.27+757.27+957.27怎么巧算?10.1×9.9怎么巧算?
157.27+357.27+557.27+757.27+957.27怎么巧算?10.1×9.9怎么巧算?
157.27+357.27+557.27+757.27+957.27怎么巧算?10.1×9.9怎么巧算?
157.27+357.27+557.27+757.27+957.27
=150+350+550+750+950+7.27×5
=2750+36.35
=2786.35
10.1×9.9
=(10+0.1)×9.9
=99+0.99
=99.99