ln[(x-5)(x+3)/4]=ln(2x-9)
去掉ln
(x-5)(x+3)/4=2x-9
(x-5)(x+3)=4(2x-9)
x1=3
x2=7
因为x-5>0,2x-9>0
所以x>4.5
x1舍掉
x=7