(1-1/2+1/3-1/4+……+1/49-1/50)÷(1/26+1/27+……+1/50)=______

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(1-1/2+1/3-1/4+……+1/49-1/50)÷(1/26+1/27+……+1/50)=______(1-1/2+1/3-1/4+……+1/49-1/50)÷(1/26+1/27+……+1/

(1-1/2+1/3-1/4+……+1/49-1/50)÷(1/26+1/27+……+1/50)=______
(1-1/2+1/3-1/4+……+1/49-1/50)÷(1/26+1/27+……+1/50)=______

(1-1/2+1/3-1/4+……+1/49-1/50)÷(1/26+1/27+……+1/50)=______
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