9(y-z)的平方-(3y+z)(-z+3y)
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9(y-z)的平方-(3y+z)(-z+3y)
9(y-z)的平方-(3y+z)(-z+3y)
9(y-z)的平方-(3y+z)(-z+3y)
解
9(y-z)²-(3y+z)(-z+3y)
=9(y²-2yz+z²)-(3y+z)(3y-z)
=9y²-18yz+9z²-9y²+z²
=10z²-18yz
9(y-z)^2-(3y+z)(-z+3y)
=9y^2-18yz+9z^2-(9y^2-z^2)
=9y^2-18yz+9z^2-9y^2+z^2
=10z^2-18yz