cho hàm số y=(m-3)x+2n(m khác 3) có đồ thị là (d). tính giá trị của m và n để (d) đi qua 2 điểm: a)A=(2;-2) và B(-1/2;1/3). b)cắt trục tung tại M(0;căn 3+2) và cắt trục hoành tại N(2- căn 3;0)

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