用配方法解,谢谢:-y^2+2y+3=0

2025-04-17 21:03:29
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回答1:

-y^2+2y+3=0
y^2-2y=3
y^2-2y+1=3+1
(y-1)^2=4
y-1=2 y=3 或
y-1=-2 y=-1