用求根公式即可.
5/2 x² - 48/7 x + 2=0
35 x² -96 x + 28=0
x = (96 +/- √(96²-4*35*28) )/(2*35)
= (48 +/- 2√331)/35不好意思弄错了 原题是这样的2x²+2/x²-7x+7/x+2=02x²+2/x² = 2(x-1/x)² +42x²+2/x²-7x+7/x+2 = 2(x-1/x)² +4 -7(x-1/x) +2 = 2u² -7u +6 =0(u-2)(2u-3)=0u=2或 u= 3/2x-1/x = 2x²-2x -1 =0x = 1+/- √2或x-1/x = 3/22x² - 3x -2=0(x-2)(2x+1)=0x= 2 或 x= -1/2