已知y<3 化简 (y+3)×√y²-6y+9
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已知y<3 化简 (y+3)×√y²-6y+9
![已知y<3 化简 (y+3)×√y²-6y+9](/uploads/image/z/19996517-29-7.jpg?t=%E5%B7%B2%E7%9F%A5y%EF%BC%9C3+%E5%8C%96%E7%AE%80+%EF%BC%88y%2B3%29%C3%97%E2%88%9Ay%26%23178%3B-6y%2B9)
(y+3)×√y²-6y+9
=(y+3)×√(y-3)²
= (y+3)×|y-3|
=(y+3)(3-y)
=9-y²
=(y+3)×√(y-3)²
= (y+3)×|y-3|
=(y+3)(3-y)
=9-y²
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