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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![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](/uploads/image/z/2999193-33-3.jpg?t=%E9%A2%98+1+2+3+4+5+6+7+8+9+%E8%BF%99%E5%8D%81%E6%95%B0%E7%94%A8%E5%8A%A0%E5%8F%B7%E7%9A%84%E4%B9%98%E5%8F%B7%E6%80%8E%E6%A0%B7%E7%AE%97%E7%AD%89%E4%BA%8E100.%E4%B8%80%E5%BC%A0%E7%BA%B8%E5%AF%B9%E6%8A%98%E4%B8%80%E6%AC%A1%E4%B8%80%E6%9D%A1%E6%8A%98%E7%97%95+2%E6%AC%A13%E6%9D%A1%E7%97%95+3%E6%AC%A17%E6%9D%A1%E7%97%95+N%E6%AC%A1%E5%87%A0%E6%9D%A1%E7%97%95%E8%BF%B91.3.7.15.31.%E7%AC%ACN%E6%AC%A1%E6%98%AF%E5%87%A011%2B13%2B15%2B.%2B197%2B199%3D1%2A3%2F1%2B3%2A5%2F1%2B5%2A7%2F1%2B.%2B97%2A99%2F1%2B99%2A101%2F1%3D2%2A4%2F2%2B4%2A6%2F2%2B6%2A8%2F2%2B.%2B96%2A98%2F2)
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