1/12= 1/3x1/4 1/20=1/4X1/5 11/14=1/2X11/7（14分之11?看仔细点） 1/42=1/2X1/3X1/7 36/17=（12+2+3）/36=12/36+2/36+3/36=1/3+1/13+1/12 1/16=3X(1/?) 1/16X1/3 =1/?1/48=1/?..
1/12+1/20+11/14+1/42=（简便计算,.1/?+1/?+1/?=17/36 .1/?+1/?+1/?=1
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