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(1-x)^6(1+x)^4展開式中x^3的項有四個來源1)前部分的常數項乘以後部分的3次項,係數是C(6,0)C(4,3)=4 2)前部分的1次項乘以後部分的2次項,係數是-C(6,1)C(4,2)=-36 3)前部分的2次項乘以後部分的1次項,係數是C(6,2)…
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