计算：3（y-z)^2-(2y+z)(-z+2y)
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计算：3（y-z)^2-(2y+z)(-z+2y)计算：3（y-z)^2-(2y+z)(-z+2y)计算：3（y-z)^2-(2y+z)(-z+2y)3(y-z)^2-(2y+z)(-z+2y)=3(
计算：3（y-z)^2-(2y+z)(-z+2y)
计算：3（y-z)^2-(2y+z)(-z+2y)
计算：3（y-z)^2-(2y+z)(-z+2y)
3(y-z)^2-(2y+z)(-z+2y)
=3(y-z)^2-(2y+z)(2y-z)
[平方差公式]
=3(y-z)^2-[(2y)^2-z^2]
[完全平方公式]
=3(y^2-2yz+z^2)-4y^2+z^2
=-y^2-6yz+4z^2
3（y-z)^2-(2y+z)(-z+2y)
=3y^2-6yz+3z^2-4y^2+z^2
=-y^2-6yz+4z^2
3(y-z)^2-(2y+z)(-z+2y)
=3(y-z)^2-(2y+z)(2y-z)
=3(y-z)^2-[(2y)^2-z^2]
=3(y^2-2yz+z^2)-4y^2+z^2
=-y^2-6yz+4z^2
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