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是對的,6.8可以看成是6和0.8 祝樓主學習進步〜;〜;
6.8裡面有68個0.1
設這個數是x 3.6*.8+2.5x=12.88 2.88+2.5x=12.88 2.5x=10 x=4 這個數是4
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