x²-y²+2y-1是多少,

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x²-y²+2y-1是多少,
x²-y²+2y-1是多少,

x²-y²+2y-1是多少,
x²-y²+2y-1
=x²-(y²-2y+1)
=x²-(y-1)²
=(x+y-1)(x-y+1)
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x²-y²+2y-1=x²-(y²-2y+1)=x²-(y-1）²=(x+y-1)(x-y+1)