(x-3分之x-1 - x分之x-4)除以x平方+x-6分之x平方-3x

[ (x - 1) / (x - 3) - (x - 4) / x ] 除以 [ (x^2 - 3x) / (x^2 +x - 6) ]= [ x(x - 1) - (x - 3)(x - 4) ] / [ x(x - 3)] 除以 [ x(x - 3) / (x - 2)(x+3) ]= (x^2 - x - x^2 + 7x - 12) / [x(x - 3)] 乘以 (x - 2...