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1/2²-1+1/4²-1+1/6²-1+.+1/50²-1怎么解,
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1/2²-1+1/4²-1+1/6²-1+.+1/50²-1怎么解,
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答案和解析
1/(2²-1)+1/(4²-1)+1/(6²-1)+.+1/(50²-1)
=1/(1×3)+1/(3×5)+1/(5×7)+……+1/(49×51)
=(1-1/3+1/3-1/5+1/5-1/7+……+1/49-1/51)÷2
=(1-1/51)÷2
=50/51÷2
=25/51
=1/(1×3)+1/(3×5)+1/(5×7)+……+1/(49×51)
=(1-1/3+1/3-1/5+1/5-1/7+……+1/49-1/51)÷2
=(1-1/51)÷2
=50/51÷2
=25/51
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