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4x²+8xy-12x = 4x(x + 2y - 3)
Ad2.
(2x+1)(x+3) dla x=-1
(2*(-1) + 1)(-1+3) = (-2+1)(-1+3) = (-1)*2 = -2
Ad3.
3(2a+5b)-2(2b-a) = 6a+15b - 4b + 2a = 8a + 11b