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2 năm trước
Bài 3. Giải các phương trình sau: a) (3x+2)^2 – (3x -2)² = 5x + 38 c) (x+3)² – (x– 3)² = 6x +18 e) (x+1)(x² – x + 1) -2x = x(x- 1)(x+1) b) 3(x - 2)^2 + 9(x – 1) = 3(x² + x – 3) d) (x-1)^3– x(x+ 1)² = 5x(2–x)–11(x+2) f) (x-2)^3 + (3x-1)(3x +1) = (x + 1) ^3
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