x^2+9y^2+4z^2-6xy-12yz+4xz=?Please,tell me the answer as fast as you could.I'm so sorry for I didn't tell you this.
问题描述：
x^2+9y^2+4z^2-6xy-12yz+4xz=?
Please,tell me the answer as fast as you could.
I'm so sorry for I didn't tell you this.
答
(3y-x-2z)^2
答
(x-3y+2z)^2