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已知:x=(根号5+根号3)分之1,y=(根号5-根号3)分之1,求(x+2)(y+2)的值
已知:x=(根号5+根号3)分之1,y=(根号5-根号3)分之1,求(x+2)(y+2)的值
2024-12-21 18:48:16
推荐回答(1个)
回答1:
x=(√5-√3)/2
y=(√5+√3)/2
∴x+y=√5
xy=1/2
(x+2)(y+2)=xy+2(x+y)+4=1/2+2√5+4=9/2+2√5
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