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3x - (y - 2x) = 3x - y + 2x = 5x - y
-(3a + 6) - 4 = -3a - 6 - 4 = -3a - 10 = -(3a + 10)
3x - (y - 2x) = 3x - y + 2x = 5x - y
-(3a + 6) - 4 = -3a - 6 - 4 = -3a - 10 = -(3a + 10)
poieważ
x-2 ( 2x -3 ) = x przepisujesz - 2 x też zmieniasz znak na plus ( jesli masz - to na plus ) piszesz = zmieniasz znak + 3