(1)X²-(1+2√3)X-3+√3=0(2)2X+2/X+X²+1/X²-6=0
问题描述:
(1)X²-(1+2√3)X-3+√3=0
(2)2X+2/X+X²+1/X²-6=0
答
1,X²-X-2√3X-3+√3=0
X²-2√3X+3-6-X+√3=0
(X-√3)²-(X-√3)-6=0
(X-√3-3)(X-√3+2)=0
X=√3+3 或X=√3-2
2,2(X+1/X)+(X+1/X)²-2-6=0
(X+1/X)²+2(X+1/X)-8=0
(X+1/X-4)(X+1/X+2)=0
X+1/X=4或X+1/X=-2
解得X=2±√3或X=-1