Bonsoir,
8x²+4x = 4x(2x+1)
3(x-5)-(x-5) = 2(x-5)
(x+1)(2x+3)+(x-1)(x+1) = (x+1)[(2x+3)+(x-1)] = (x+1)(3x+2)
9x²+18x = 9x(x+2)
3/(-2) - 7/2 - (-3/2) = -3/2 - 7/2 + 3/2 = -7/2
5(-10/5-(-1/5)) = 5(-9/5) = -9
5(-10/3-(-7/5)) = 5(-50/15+21/15) = 5(-29/15) = 5(-29/(3×5)) = -29/3
