2(x/x+2)平方+(x/x+2)=3
设x/(x+2)=y,则
2y^2+y-3=0
(2y+3)(y-1)=0
y=-3/2或y=1
由x/(x+2)=-3/2,解之得x=-6/5
由x/(x+2)=1,解之得x无解
所以x=-6/5