用公式法解(3-y)²=2y(y-3)3x²-(x+2)²+2x=0
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![用公式法解(3-y)²=2y(y-3)3x²-(x+2)²+2x=0](/uploads/image/z/3996276-60-6.jpg?t=%E7%94%A8%E5%85%AC%E5%BC%8F%E6%B3%95%E8%A7%A3%283-y%29%26%23178%3B%3D2y%28y-3%293x%26%23178%3B-%28x%2B2%29%26%23178%3B%2B2x%3D0)
用公式法解(3-y)²=2y(y-3)3x²-(x+2)²+2x=0
用公式法解(3-y)²=2y(y-3)
3x²-(x+2)²+2x=0
用公式法解(3-y)²=2y(y-3)3x²-(x+2)²+2x=0
(3-y)²=2y(y-3)
=(3-y)²-2y(y-3)
=(3-y)²+2y(3-y)
=(3-y)(3-y+2y)
=(3-y)(3+y)