Question

x-5分之11-(x-7分之7)-（x+2分之11）+（x+4分之7）

Answer 1

11/(x-5)-7/(x-7)-11/(x+2)+7/(x+4)

=11[1/(x-5)-1/(x+2)]-7[1/(x-7)-1/(x+4)]

=77/(x-5)(x+2)-77/(x-7)(x+4)

=77[(x-7)(x+4)-(x-5)(x+2)]/(x-7)(x+4)(x-5)(x+2)

=1386/(x-7)(x+4)(x-5)(x+2)