Tìm y (y - 2/5) x 1/2 =1 (y + 4/21) : 3 =2 1 1/2 x y + y x 2 3/4=17 Các bạn ui cái số 1 1/2 với cái số 2 3/4 là hỗn số nha các bạn. Thanks các bạn

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