(x2-根号2 x+1/3)^2楼主是这个意思吗?先把x2-根号2 x看成整体原式=(x2-根号2 x)^2+2(x2-根号2 x)+1/9=x^4-2根号2x^3+2x^2+2x^2-2根号2x+1/9=x^4-2根号2x^3+4x^2-2根号2x+1/9你看下,明白没?没得话,我再解释!这里说实...