化简:x除以y分之x乘x分之1=y*1/x=y/x即x分之y化简：（y-x分之1）除以(x-y分之1）=(xy-1)/x ÷ (xy-1)/y=y/x即x分之y化简 x分之1除以x-x^2=1/x * 1/(x-x²)=1/(x²-x³)即(x²-x³)分之1...