Tìm x, biết
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VÍ DỤ 17. Tìm x, biết
a) \((2x + 3)(x - 4) + (x - 5)(x - 2) = (3x - 5)(x - 4);\)
b) \(2(x - 5)(x + 5) - (x + 2)(2x - 3) + x(x^2 - 8) = (x + 1)(x^2 - x + 1);\)
c) \(\frac{4}{5} x^2 \left( \frac{x}{3} - \frac{1}{2} \right) - \left( \frac{1}{5} x - \frac{2}{3} \right) \left( \frac{4}{3} x^2 + 1 \right) = \frac{22}{45} x^2.\)
VÍ DỤ 17. Tìm x, biết
a) \((2x + 3)(x - 4) + (x - 5)(x - 2) = (3x - 5)(x - 4);\)
b) \(2(x - 5)(x + 5) - (x + 2)(2x - 3) + x(x^2 - 8) = (x + 1)(x^2 - x + 1);\)
c) \(\frac{4}{5} x^2 \left( \frac{x}{3} - \frac{1}{2} \right) - \left( \frac{1}{5} x - \frac{2}{3} \right) \left( \frac{4}{3} x^2 + 1 \right) = \frac{22}{45} x^2.\)