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ngohonganh31
2 năm trước
cho 3 đơn thức A = -12 x mũ 2 y mũ 4;B = -6 x mũ 2 y mũ 4;C= 9 x mũ 2 y mũ 4 a, tính A.B.C và A + B, A + C ,B + C, A -C, B - C b, Tính giá trị của biểu thức B - A và C - A Biết x = -2, y = 3
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