求教数分:关于定积分题如图示,解答已给出,但不是很明白:倒数第三个等号,为什么等价无穷小,它们的和的极限就相同.能否给个思路或者参考书目,1,[a,b]内Rimann可积就一定有界吗?如f(x)=pi

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