Ꮶ若x-y=根号2-1,xy=根号2,则代数式(x-1)(y-1)的值等于?

谢了
2024-11-18 18:19:54
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回答(1):

若x+y=根号2-1,xy=根号2,则代数式(x-1)(y-1)的值等于?
(x-1)(y-1)
=xy-x-y+1
=xy-(x+y)+1
=根号2-根号2+1+1
=2