若(x+1)²+|y-3|=0,求代数式2x²-y²的值
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若(x+1)²+|y-3|=0,求代数式2x²-y²的值
若(x+1)²+|y-3|=0,求代数式2x²-y²的值
若(x+1)²+|y-3|=0,求代数式2x²-y²的值
(x+1)²+|y-3|=0
x+1=0,x=-1
y-3=0,y=3
2x²-y²
=2x1-9
=2-9
=-7
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