bonjour pourriez vous me dire si cela est correct:
k(a+b)=ka+kb
k(a-b)=ka-kb
(a+b)(c+d)=ac+ad+bc+bd
(a+b)²=a²+2ab+b²
(a-b)²=a²-2ab+b²
(a-b)(a+b)=a²-b²

2x(3-2x)=-4x²+6x
(2x-3)(1-5x)=2x-10x²-3+15x=17x-10x²-3
(5+x)²=25+10x+x²
(2x+3)²=2x²+12x+9
(3x-2)²=3x²-12x+4
(7x-1)(7x+1)=49x²-1
(x+racine3)(x-racine3)=x²-3