Question

x方-1分之x-4除以(x方+2x+1分之x方-3x-4)加上x-1分之1怎么化简

Answer 1

=(x-4)/(x+1)(x-1) 除以 (x-4)(x+1)/(x+1)平方 + 1/(x-1)

=(x-4)/(x+1)(x-1) 乘以 (x+1)平方/(x-4)(x+1) + 1/(x-1)

=(x-4)/(x+1)(x-1) 乘以 (x+1)/(x-4) + 1/(x-1)

=1/(x-1)+1/(x-1)

=2/(x-1)