作业帮用公式法解(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
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)