Ответы на вопрос:
5(х-2)-4(5х-3)=17-12х 5х-10-20х+12=17-12х 5х-20х-12х=10+12-17 -27х=5 х=-27: 5 х=-5,4
2x^2+3x = 2x^2+21 3x = 21 x = 7 (3x+1)(4x-5) = 12x^2-13x+1 12x^2-11x-5 = 12x^2-13x+1 2x = 6 x = 3 (2x-3)(3x+-5) = 12x^2-13x+1 6x^2+14x-9x-21-x+5 = 12x^2-13x+1 -6x^2+17x = 17 x(17-6x) = 17
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