下式中各个()里应该填“+”还是“-”?1+2+3-4+5+6-7+8+9-10+11...()40()...()99()100
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下式中各个()里应该填“+”还是“-”?1+2+3-4+5+6-7+8+9-10+11...()40()...()99()100
下式中各个()里应该填“+”还是“-”?1+2+3-4+5+6-7+8+9-10+11...()40()...()99()100
下式中各个()里应该填“+”还是“-”?1+2+3-4+5+6-7+8+9-10+11...()40()...()99()100
这题的规律是加2个数,再减1个数,这是一个循环
1不算,循环从2开始(2,3,4)(5,6,7)(8,9,10)……
40-1=39,39中有13个循环,所以是(-)40(+)
99-1=98,98中有32个循环,余下2个数,所以(+)99(-)100
下式中各个()里应该填“+”还是“-”?1+2+3-4+5+6-7+8+9-10+11...()40()...()99()100
下式中各个()里应该填+还是-?1+2+3-4+5+6-7+8+9-10+11...()40()...()99()100
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