问题
问答题
求∫f(x)dx，其中
答案
参考答案：[解] 首先由于f(x)连续，可利用变上限定积分[*]求出f(x)一个原函数．即
当x≤0时，[*]
当x＞0时，[*]
其次，利用原函数与不定积分的关系，可得
[*]
搜题请搜索小程序“爱下问搜题”
求∫f(x)dx，其中
参考答案：[解] 首先由于f(x)连续，可利用变上限定积分[*]求出f(x)一个原函数．即
当x≤0时，[*]
当x＞0时，[*]
其次，利用原函数与不定积分的关系，可得
[*]
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| Maria was a 42-year-old lady. She always said she had one of the world's best _1_ . She worked for National Park Service at the Statue of Liberty (自由女神雕像)in New York City. " _2_ come here from all over the world, "Maria said. "Helping them learn about'Lady Liberty'is really _3_ ." Maria began her day just like one of the visitors. She took a fifteen-minute boat _4_ to Liberty Island, where the statue _5_ . Then she helped visitors see the exhibits in the museum. The museum is _6_ the famous statue. In the museum, Maria often talked with visitors _7_ they climbed to the statue's crown. (皇冠). "It's fun to talk with all these people, "she said. "Besides, it _8_ me my exercise. There are 154 steps on the way to the crown. " 
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