需要步骤,请帮忙解答
1个回答
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(x+2)(y+2)
=xy+2x+2y+4
=1/(根号5+根号3)乘以1/(根号5-根号3)+2/(根号5+根号3)+2/(根号5-根号3)+4
=1/2+2(根号5-根号3)/2+2(根号5+根号3)/2+4
=5根号5/2
=xy+2x+2y+4
=1/(根号5+根号3)乘以1/(根号5-根号3)+2/(根号5+根号3)+2/(根号5-根号3)+4
=1/2+2(根号5-根号3)/2+2(根号5+根号3)/2+4
=5根号5/2
追答
(x+2)(y+2)
=xy+2x+2y+4
=1/(根号5+根号3)乘以1/(根号5-根号3)+2/(根号5+根号3)+2/(根号5-根号3)+4
=1/2+2(根号5-根号3)/2+2(根号5+根号3)/2+4
=5/2+2根号5
(x+2)(y+2)
=xy+2x+2y+4
=1/(根号5+根号3)乘以1/(根号5-根号3)+2/(根号5+根号3)+2/(根号5-根号3)+4
=1/2+2(根号5-根号3)/2+2(根号5+根号3)/2+4
=9/2+2根号5
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