3(y-z)²-(2y+z)(-z+2y)求过程
问题描述:
3(y-z)²-(2y+z)(-z+2y)求过程
答
=3y²-6yz+z²-4y²+z²
=-y²-6yz+2z²
3(y-z)²-(2y+z)(-z+2y)求过程
=3y²-6yz+z²-4y²+z²
=-y²-6yz+2z²