Répondre :
1 (2x + 3) - \sqrt{x-1} . 2
2.\sqrt{X - 1}
----------------------------------------------
(2x +3)²
=((2x+3)/(2√(x-1))-2√(x-1))/(2x+3)²
=((2x+3)-(2√(x-1))²)/((2x+3)²2√(x-1))
=(2x+3-4(x-1))//((2x+3)²2√(x-1))
=(-2x+7)/((2x+3)²2√(x-1))