第四题计算二重积分，高等数学下求大神，悬赏不够可以加。答案是0

x^2+y^2≤2x (x-1)^2+y^2≤1 ∫∫ydxdy =∫∫rsinθ*rdrdθ =∫(-π/2到π/2) sinθdθ ∫(0到2cosθ) r^2dr =∫(-π/2到π/2) 8(cosθ)^3sinθ/3 dθ =8/3∫(-π/2到π/2) (cosθ)^3sinθdθ =-2/3 (cosθ)^4| (-π/2到π/2) =0