x-2分之1+3=2-x分之1-x x-1/2+3=2-1/x-x x+1/x+x=2+1/2-3 2x+1/x=-1/2 2x2+1=-x/2 x2+x/4=-1/2 x2+x/4+(1/8)=1/64-1/2 (x+1/8)2=-31/64 无实数解 x+1/8=±√31i/8 x=-1/8±√31i/8
