1÷(5X+4)-1÷(6X-5)=1÷(4X+5)-1÷(5X-4)

问题描述:

1÷(5X+4)-1÷(6X-5)=1÷(4X+5)-1÷(5X-4)

1/(5x+4)-1/(6x-5)=1/(4x+5)-1/(5x-4)
1/(5x+4)+1/(5x-4)=1/(6x-5+)+1/(4x+5)
10x/(25x2-16)=10x/(24x2+10x-25)
x2+10x+9=0
(x+1)(x+9)=0
x1=-1 x2=-9