计算二重积分:∫[0,1]dx∫[0,x^½]e^(-y²/2)dy
问题描述:
计算二重积分:∫[0,1]dx∫[0,x^½]e^(-y²/2)dy
答
原式=∫dy∫e^(-y²/2)dx (作积分顺序变换)=∫(1-y²)e^(-y²/2)dy=∫e^(-y²/2)dy-∫y²e^(-y²/2)dy=∫e^(-y²/2)dy-{[-ye^(-y²/2)]│+∫e^(-y²/2)dy} (应用分部积分法)=∫...