1/2x3x4+1/3x4x5+1/4x5x6+……+1/48x49x50=x是乘号!过程.答案.
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![1/2x3x4+1/3x4x5+1/4x5x6+……+1/48x49x50=x是乘号!过程.答案.](/uploads/image/z/350398-46-8.jpg?t=1%2F2x3x4%2B1%2F3x4x5%2B1%2F4x5x6%2B%E2%80%A6%E2%80%A6%2B1%2F48x49x50%3Dx%E6%98%AF%E4%B9%98%E5%8F%B7%21%E8%BF%87%E7%A8%8B.%E7%AD%94%E6%A1%88.)
1/2x3x4+1/3x4x5+1/4x5x6+……+1/48x49x50=x是乘号!过程.答案.
1/2x3x4+1/3x4x5+1/4x5x6+……+1/48x49x50=
x是乘号!过程.答案.
1/2x3x4+1/3x4x5+1/4x5x6+……+1/48x49x50=x是乘号!过程.答案.
裂项求和
1/((n-1)n(n+1))=(1/2)*(1/((n-1)n)-1/(n(n+1)))
接着便可算了
结果我算的是(1/2)*(1/6-1/(49*50))