Toán Lớp 7: CMR:Mọi số tự nhiên x,y thì
(20x+7y)$\vdots$31⇔(x+5y)$\vdots$31
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Toán Lớp 7: CMR:Mọi số tự nhiên x,y thì
(20x+7y)$\vdots$31⇔(x+5y)$\vdots$31
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