Evaluate the double integral ∬R(x+y)dA\iint_R (x + y) dA∬R(x+y)dA over the region R=[0,1]×[0,1]R = [0, 1] \times [0, 1]R=[0,1]×[0,1].
0.50.50.5
1.01.01.0
1.51.51.5
2.02.02.0