试用观察法得出下列积分的值,并说明观察时所依据的是什么?[tex=0.714x1.0]J/aA9EEo0KmJFnWWfX7LmQ==[/tex]是正向单位圆周[tex=3.143x1.357]h731PvpnSz6MDMrelHU7Cw==[/tex].[tex=3.286x2.643]Y8CRcHuMVg8In0SOJjlU702IsEyqm/mNZpj+luV2Sf8=[/tex].
举一反三
- 计算下列积分, [tex=0.714x1.0]J/aA9EEo0KmJFnWWfX7LmQ==[/tex]为正向圆周:[tex=10.0x2.857]FE2emU4+moBspjp3OOFOx0w4Mcsy9ccTLtrgL9f4R94dJhqSJhzW33AnbPpu+aOrctcSHsK9jgidudB0Vi6flSWJv0T8aN9Ezey7IyXtQHgtCDKWTyAJI2z15YMYy8ad[/tex] [tex=3.857x1.357]kaz1B9sRr6x07io4M2qrtA==[/tex].
- 计算下列积分, [tex=0.714x1.0]J/aA9EEo0KmJFnWWfX7LmQ==[/tex]为正向圆周:[tex=18.286x2.357]r/tGl1lzQYxWTkoprtVaq8/ObVMzrS54dIRKjOsXZj4CZiPZLjUQ8vHvLumBMf6CE3PA2IDDfaGIRw/gMW1RSiexWDLVilObIfTTg2mKfrmYF2FRWtwMGF4bL++qGxnu[/tex]
- 计算下列积分， [tex=0.714x1.0]J/aA9EEo0KmJFnWWfX7LmQ==[/tex] 为正向圆周。[p=align:center][tex=11.571x2.714]G8Basw+pnuC4PEhmMHYw77KDoFPNRHxAmwvnVX4/UW0UNZ1HK7+qFDWeY50PcXSmbWLdIucOY/0p8FRDteF1kw==[/tex]
- 计算下列各积分， [tex=0.714x1.0]J/aA9EEo0KmJFnWWfX7LmQ==[/tex] 为正向圆周。[tex=4.929x2.714]G8Basw+pnuC4PEhmMHYw71d/NWLfWW6MuO724tWZeAhghxHlEZo9j/kaPOHoeyYs[/tex]([tex=0.643x0.786]SBMIs+VUk7//BOpfqlQl0w==[/tex] 为一整数 ), [tex=5.143x1.357]MBlCfCnIrPkq2CO2XCtTIQ==[/tex] .
- 计算下列积分：[tex=7.857x2.643]K8JnqUKuGD45MIdILhZky7hjQSWbdRCEsjZQZh5TXooH0iDOJ7wYYepYrzEFCQ2j[/tex]，[tex=0.714x1.0]J/aA9EEo0KmJFnWWfX7LmQ==[/tex]为[tex=4.214x1.357]H+potUBb+5x2HX3ZLXedoA==[/tex].