A、u(x)f(x)v(x)g(x)=d(x) B、u(x)f(x)+v(x)g(x)=d(x) C、u(x)f(x)/v(x)g(x)=d(x) D、u(x)/f(x)+v(x)/g(x)=d(x)
A、(x-1)(x+2) B、(x+1)(x-2) C、(x-1)(x-2) D、(x-2)(x-3)