bonjour
A=8x-3/2x-4x+7/5
=5(8x-3)-2x(4x+7)/10x
=40x-15-8x²+14x/10x
=26x-15-8x²/10x
B=7x-3/-3x+4-2x+5/x+1
=(7x-3)(x+1)-(2x+5)(-3x+4)/(-3x+4)(x+1)
=7x²+7x-3x-3-(-6x²+8x-15x+20)/-3x²-3x+4x+4
=7x²+7x-3x-3+6x²-8x+15x-20/-3x²-3x+4x+4
=7x²+7x-3x-3+6x²+7x-20/-3x²+x+4
=13x²+11x-23/-3x²+x+4
