y分之x^2-1除以y^2分之x+1得多少,

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y分之x^2-1除以y^2分之x+1得多少,

y分之x^2-1除以y^2分之x+1得多少,
y分之x^2-1除以y^2分之x+1得多少,

y分之x^2-1除以y^2分之x+1得多少,
[(x²-1)/y]÷[(x+1)/y²]
=(x²-1)y²/[(x+1)y]
=(x+1)(x-1)y²/[(x+1)y]
=(x-1)y
=xy-y