3/1*2+3/2*3+3/3*4+……+3/99*100.如果写出以下两题,5/6+11/12+19/20+29/30+41/42=?(9又2/7+7又2/9)÷(5/7+5/9)=?到15点30分失效
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![3/1*2+3/2*3+3/3*4+……+3/99*100.如果写出以下两题,5/6+11/12+19/20+29/30+41/42=?(9又2/7+7又2/9)÷(5/7+5/9)=?到15点30分失效](/uploads/image/z/223251-51-1.jpg?t=3%2F1%2A2%2B3%2F2%2A3%2B3%2F3%2A4%2B%E2%80%A6%E2%80%A6%2B3%2F99%2A100.%E5%A6%82%E6%9E%9C%E5%86%99%E5%87%BA%E4%BB%A5%E4%B8%8B%E4%B8%A4%E9%A2%98%EF%BC%8C5%2F6%2B11%2F12%2B19%2F20%2B29%2F30%2B41%2F42%3D%EF%BC%9F%EF%BC%889%E5%8F%882%2F7%2B7%E5%8F%882%2F9%EF%BC%89%C3%B7%EF%BC%885%2F7%2B5%2F9%EF%BC%89%3D%EF%BC%9F%E5%88%B015%E7%82%B930%E5%88%86%E5%A4%B1%E6%95%88)
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