3(х*2-2xy+y*2)/6(x-y)(x+y)=(x-y)*2/2(x-y)(x+y)=x-y/2(x+y).
2пример. 7у*2(х*2-2ху+у*2)/(х*2-у*2)=7у*2(х-у)/(х-у)*2(х+у)*2=7у*2/(х+у)*2
3 пример (2х+5)(4х*2+10х+25) / (2х-5)(2х-5)=4х*2+10х+25/2х-5
4 пример (с+4)(с*2-4с+16) / 3(с*2-4с+16) =с+4 / 3=5+4 / 3=9
