(1/x+1/(x+3）)×2+(x-2）/(x+3）=12/x+2/(x+3）+(x-2）/(x+3）=12/x+2/(x+3）+(x-2）/(x+3）=12/x+x/(x+3）=1两边同乘以x(x+3）有2(x+3)+x^2=x(x+3）2x+6+x^2=x^2+3x2x+6=3xx=6经检验x=6是原方程的根注：去分母后两...