∫1 0 dx∫1-x 0 f(x,y)dy=()

A.∫1-x 0 dy∫1 0 f(x,y)dy
B.∫1 0 dy∫1-x 0 f(x,y)dy
C.∫1 0 dy∫1-y 0 f(x,y)dy
D.∫1 0 dx∫1 0 f(x,y)dy
出自:兰州财经大学2021春高等数学期末考试