简便计算10*1/12+12*1/14+14*1/16+16*1/18=?
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![简便计算10*1/12+12*1/14+14*1/16+16*1/18=?](/uploads/image/z/199190-38-0.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%9710%2A1%2F12%2B12%2A1%2F14%2B14%2A1%2F16%2B16%2A1%2F18%3D%3F)
简便计算10*1/12+12*1/14+14*1/16+16*1/18=?
简便计算10*1/12+12*1/14+14*1/16+16*1/18=?
简便计算10*1/12+12*1/14+14*1/16+16*1/18=?
10*1/12+12*1/14+14*1/16+16*1/18
=(1/10-1/12+1/12-1/14+1/14-1/16+1/16-1/18)÷2
=(1/10-1/18)÷2
=2/45÷2
=1/45