练习22(1) 二。2 ∥=44 y-型: ≤x≤√y,1≤y≤2 =式 2 x-型:1≤y≤2x2,√2 x≤1 01 2 x2≤y≤2,1≤x≤√2 =d∫/(x,y)d 5i dxh f(x, y)dy+hdx-2f(x,y)dy 2 K心练习2.2(1) 二. 2. o x y 2 y = x 2 y = 2x 21 1 2 y −型: , 1  y  2 2 x y y   x −型: 1 21  x  1  x  2 1 2 , 2  y  x2, 2 x  y   =   yy I dy f x y dx 2 21 ( , ) =   +   2 2 1 21 121 2 2 ( , ) ( , ) x x dx f x y dy dx f x y dy