1
fx(x)=∫(0~2)1/6 dy=1/3 (x~(0,3))
fy(y)=∫(0~3)1/6 dx=1/2(y~(0,2))
2
∫(0~2)∫(0~2-y) 1/6 dxdy
=∫(0~2)(2-y)/6 dy
=y/3-y²/12|(0~2)
=2/3-4/12
=1/3