Toán Lớp 8: Tìm x biết: (2x + 1)(3x – 2) + x(7 – 6x) = -21
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Toán Lớp 8: Tìm x biết: (2x + 1)(3x – 2) + x(7 – 6x) = -21
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⇒ 6x²-4x + 3x -2 + 7x -6x² = 21
⇒6x²-4x + 3x + 7x – 6x² =21+2
⇒6x = 23
⇒x = 23/6