设D是由x2+y2=y,y=x,x=0所围成的平面区域,则二重积分∫∫D(x2+y2)dσ=()
A.∫π/4π/2dθ∫0cosθf(r2)rdr B.∫π/4π/2dθ∫0sinθ、f(r2)rdr C.∫0π/4dθ∫0sinθf(r2)rdr D.∫0π/4dθ∫0cosθf(r2)rdr正确答案B
设D是由x2+y2=y,y=x,x=0所围成的平面区域,则二重积分∫∫D(x2+y2)dσ=()
A.∫π/4π/2dθ∫0cosθf(r2)rdr B.∫π/4π/2dθ∫0sinθ、f(r2)rdr C.∫0π/4dθ∫0sinθf(r2)rdr D.∫0π/4dθ∫0cosθf(r2)rdr正确答案B