Question

x/x+3  - 1/x-3的值为1,怎么算

Answer 1

x/x+3 - 1/x-3=1 x/(x+3)-1=1/(x-3) x/(x+3)-(x+3)/(x+3)=1/(x-3) (x-x-3)/(x+3)=1/(x-3) -3/(x+3)=1/(x-3) -(x+3)/3=x-3 -x-3=3x-9 4x=6 x=3/2