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trananhgiang1981
2 năm trước
Bài 3: (2,0 điểm) Cho biểu thức Q = 2019x.(x + y) – x + 2020 - y a./ Tính giá trị của biểu thức Q khi x = 1 và y = -1 b./ Tính giá trị của biểu thức Q khi x = -y
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