A=40/31x39+35/39x46+30/2392+25/2964 B=91/19x31+65/19x43+39/989+143/1311 tính A/B

A=40/31x39+35/39x46+30/2392+25/2964 B=91/19x31+65/19x43+39/989+143/1311 tính A/B
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