这是第二类曲线积分曲线L化为参数方程x=t y=t^2点(0,0)到(1,1) 所以t∈[0,1]原式=∫[0,1] (2t^3+t^4) dt =(x^4)/2+(x^5)/5 | [0,1] =1/2+1/5-0/2-0/5 =7/10
