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duonganh35
2 năm trước
Bài 4. Chứng minh rằng khi a = 10; b = -5, giá trị của biểu thức: A= a(2b +1) - b(2a - 1) bằng 5. Bài 5. Tìm x, biết: 10(3x - 2) - 3(5x + 2)+5(11 - 4x) = 25.
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