题 1 2 3 4 5 6 7 8 9 这十数用加号的乘号怎样算等于100.一张纸对折一次一条折痕 2次3条痕 3次7条痕 N次几条痕迹1.3.7.15.31.第N次是几11+13+15+.+197+199=1*3/1+3*5/1+5*7/1+.+97*99/1+99*101/1=2*4/2+4*6/2+6*8/2+.+96*98/2

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