题目是:36/X-0.3-36/X=4
求X是多少?
36/(X-0.3)-36/X=4
9/(X-0.3)-9/X=1
9x-9(x-0.3)=x(x-0.3)
2.7=x^2-0.3x
10x^2-3x-27=0
(2x+3)(5x-9)=0
x=-3/2,x=9/5