40 надо решить! 1 a) (x\1 - 5x\x + 2) : (x-3)\(x+2) b) (6x+y)\3x - 5y^2\x2 * x\15y c) (x+y)\(x-y) - (x-y)\(x+y) * xy\x^2 - y^2 : - деление, если что.

A) (x\1 - 5x\x + 2) : (x-3)\(x+2)=(x²+2x-5x)/(x+2)*(x+2)/(x-3)=
=(x²-3x)/(x-3)=x(x-3)/(x-3)=x

b) (6x+y)\3x - 5y^2\x2 * x\15y=(6x+y)/3x-y/3x=(6x+y-y)/3x=6x/3x=2

c) (x+y)\(x-y) - (x-y)\(x+y) * xy\x^2 - y^2=(x+y)/(x-y)-xy/(x+y)²=
=(x³+x²y+xy²+y³-x²y+xy²)/[(x-y)(x+y)²]=(x³+2xy²+y³)/[(x-y)(x+y)²]