f(x)=1/(2[x]-2[1/2]),求S=f(-9)+f(-8)+……+f(10).题目中减号是加号:f(x)=1/(2[x]+2[1/2]).抱歉,抱歉……令An=2[10]/(2[n]+2[21/2]),则S=A1+A2+……+A20.但接下来,就技穷了.补充说明:2[x]是2的x次的意思,2[1/2]类同
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![f(x)=1/(2[x]-2[1/2]),求S=f(-9)+f(-8)+……+f(10).题目中减号是加号:f(x)=1/(2[x]+2[1/2]).抱歉,抱歉……令An=2[10]/(2[n]+2[21/2]),则S=A1+A2+……+A20.但接下来,就技穷了.补充说明:2[x]是2的x次的意思,2[1/2]类同](/uploads/image/z/2894424-24-4.jpg?t=f%28x%29%3D1%2F%282%5Bx%5D-2%5B1%2F2%5D%29%2C%E6%B1%82S%3Df%28-9%29%2Bf%28-8%29%2B%E2%80%A6%E2%80%A6%2Bf%2810%29.%E9%A2%98%E7%9B%AE%E4%B8%AD%E5%87%8F%E5%8F%B7%E6%98%AF%E5%8A%A0%E5%8F%B7%EF%BC%9Af%28x%29%3D1%2F%282%5Bx%5D%2B2%5B1%2F2%5D%29.%E6%8A%B1%E6%AD%89%2C%E6%8A%B1%E6%AD%89%E2%80%A6%E2%80%A6%E4%BB%A4An%3D2%5B10%5D%2F%282%5Bn%5D%2B2%5B21%2F2%5D%29%2C%E5%88%99S%3DA1%2BA2%2B%E2%80%A6%E2%80%A6%2BA20.%E4%BD%86%E6%8E%A5%E4%B8%8B%E6%9D%A5%2C%E5%B0%B1%E6%8A%80%E7%A9%B7%E4%BA%86.%E8%A1%A5%E5%85%85%E8%AF%B4%E6%98%8E%EF%BC%9A2%5Bx%5D%E6%98%AF2%E7%9A%84x%E6%AC%A1%E7%9A%84%E6%84%8F%E6%80%9D%2C2%5B1%2F2%5D%E7%B1%BB%E5%90%8C)
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f(x)=1/(2[x]-2[1/2]),求S=f(-9)+f(-8)+……+f(10).题目中减号是加号:f(x)=1/(2[x]+2[1/2]).抱歉,抱歉……令An=2[10]/(2[n]+2[21/2]),则S=A1+A2+……+A20.但接下来,就技穷了.补充说明:2[x]是2的x次的意思,2[1/2]类同
f(x)=1/(2[x]-2[1/2]),求S=f(-9)+f(-8)+……+f(10).
题目中减号是加号:f(x)=1/(2[x]+2[1/2]).抱歉,抱歉……
令An=2[10]/(2[n]+2[21/2]),则S=A1+A2+……+A20.
但接下来,就技穷了.
补充说明:2[x]是2的x次的意思,2[1/2]类同
f(x)=1/(2[x]-2[1/2]),求S=f(-9)+f(-8)+……+f(10).题目中减号是加号:f(x)=1/(2[x]+2[1/2]).抱歉,抱歉……令An=2[10]/(2[n]+2[21/2]),则S=A1+A2+……+A20.但接下来,就技穷了.补充说明:2[x]是2的x次的意思,2[1/2]类同
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