函数f(x)=e(1/2)x展开成x的幂级数为____.
∑n=1∞xn/2nn! (∣x∣﹤+∞). 解析:∵e2=∑n=1∞xn/n! ∴ex/2=∑n=1∞(x/2)n/n!= ∑n=1∞xn/2nn!
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