Question

Сократите $frac{ x^{2} -xc+2xy-yc+ y^2}{xy+xc- c^{2}+ y^{2} }$

Answer 1

[(x²+2xy+y²)-c(x+y)]/[x(y+c)+(y-c)(y+c)]=[(x+y)²-c(x+y)]/[(y+c)(x+y-c)]=
=(x+y)(x+y-c)//[(y+c)(x+y-c)]=(x+y)/(y+c)