[中學] 分數求和(苦惱ing)
(1/1)+((2/1)-(1/2))+((3/1)-(2/2)+(1/3))+...+((9/1)-(8/2)+(7/3)-(6/4)+(5/5)-(4/6)+(3/7)-(2/8)+(1/9))
小弟想了好久想不出來,版上前輩們請幫個忙 <(_"_)>
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