Question

X平方-Y平方-z平方-2yz-2x+1————————分解因式

Answer 1

X^2-2X+1=(X-1)^2

Y^2++2YZ+Z^2=(Y+Z)^2

所以X^2-2X+1-Y^2-2YZ-Z^2=(X-1)^2-(Y+Z)^2