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你運算式沒寫清. 二項式的係數,只需令X=1即可 (1+1)+(1+1)+(1+1)^2+…+(1+1)^n =2+2+2^2+2^3+.2^n =2+2+2^2+2^3+.2^n =2+(1-2^n)/(1-2) =2^n+1
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