a,(3/7.x^4.y^2).(14/15.x^3.y^4) b,(5/7.x.y^3).(-7/10.x^4.y^2).(2/3.x^3.y^4) thu gọn đơn thức và chỉ phần hệ số ,phần biến của các đơn thức thu gọn

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