求积分时原函数有ln为什么有的要绝对值,有的不用绝对值,如果不需要绝对值的式子�加了绝对值可以吗 知乎 Template




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tomski求积分时原函数有ln为什么有的要绝对值,有的不用绝对值,如果不需要绝对值的式子�加了绝对值可以吗 知乎 coloring