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(1+x)^2(1-x)^5這個有點像組合比如從(1+x)^ 2中取x^2,則(1-x)^5中得取一個-x和4個1即x^2.(-x).1.1.1.1=-x^3.總的就分為三種 (1+x)^2:1、x、x^2 (1-x)^5:-x^3、(-x)^2、-x最後答案為-1
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