若X^2-y^2=48,x+y=4,则x=?,y=?
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若X^2-y^2=48,x+y=4,则x=?,y=?
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x^2-y^2=48,x+y=4,则x=?y=?
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