integral(abs(9x-5)) from 0 tu 9
first, 9x-5=0 at x=5/9, so brake up intu 2 parts, o tu 5/9, then tu 9
integral=4.5x^2 -5x
at x=0...0
at x=5/9...or x=0.555555555, x^2=0.308641975, 4.5*x^2=13.888888888
.....-5x=-2.777777777
so 4.5x^2-5x=13.888888 -2.777777=11.11111111111..
me leev part 2 for yu tu du