1.(1)
∫(0,1)dx∫(0,x²-4x+5) dy
=∫(0,1) (x²-4x+5)dx
=(1/3 x³-2x²+5x)|(0,1)
=1/3 -2+5=10/3
(2)
∫(0,1) dx∫(e^(-x),e^x) dy
=∫(0,1) [e^x-e^(-x)]dx
=[e^x+e^(-x)]|(0,1)
=e + 1/e-2
(3)
∫(1,3) dy∫(1/y,y) dx
=∫(1,3) (y-1/y)dy
=(1/2 y²-ln|y|)|(1,3)
=9/2-ln3-1/2
=4-ln3