x=2+√2 ==>x-2=√2 ==>x^2-4x+2=0x^2=4x-2圆括号部分为(x+2/(x-3)/2)=(x+2)/(1/2x-3/2)=2(x+2)/(x-3)短除号后面的为(x-4)/x原式为2(x+2)/(x-3)*[x/(x-4)]=[2x^2+4x]/[x^2-7x+12]=4(x-3)/(-3x+10)将x=2+√2代入得:原式=4(√2-1)/(4-3√2)=4+2√2 运算量过大加上又是打字难免有一点错误,但思路清晰,若有错可以套改