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(+1)*(+2)*……*(+203)*(-1/203)*……*(-1/2)*(-1)
题目详情
(+1)*(+2)*……*(+203)*(-1/203)*……*(-1/2)*(-1)
▼优质解答
答案和解析
(+1)*(+2)*...*(+202)*(+203)*(-1/203)*(-1/202)*...*(-1/2)*(-1)
= (+1)*(-1)*(+2)*(-1/2)*...*(+202)*(-1/202)*(+203)*(-1/203)
= [(+1)*(-1)]*[(+2)*(-1/2)]*...*[(+202)*(-1/202)]*[(+203)*(-1/203)]
= (-1)*(-1)*...*(-1)*(-1)（共203个(-1)）
= -1
= (+1)*(-1)*(+2)*(-1/2)*...*(+202)*(-1/202)*(+203)*(-1/203)
= [(+1)*(-1)]*[(+2)*(-1/2)]*...*[(+202)*(-1/202)]*[(+203)*(-1/203)]
= (-1)*(-1)*...*(-1)*(-1)（共203个(-1)）
= -1
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