图中所示区域的面积S用定积分可以表示为-|||-y y=x^2-|||-S-|||-1 2 x-|||-4 =(int )_(1)^2(x)^2dx-|||-B) =(int )_(1)^4(x)^2dx-|||-C =(int )_(2)^1(x)^2dx-|||-D =(int )_(4)^1(x)^2dx