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2 năm trước
Thực hiện phép nhân, rút gọn rồi tính giá trị biểu thức: a) x(x + y) + y(x – y) tại x = -8 và y = 7; b) x(x2 - y) + x(y2 - y) – x(x2 + y2) tại x = 12 và y = 100.
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