3/4=2/4+1/4=1/2+1/42/7=8/28=7/28+1/28=1/4+1/287/16=4/16+3/16=1/4+1/8+1/165/27=10/54=9/54+1/54=1/6+1/54思路：(a+1)/ab=a/ab+1/ab=1/b+1/ab所以尽量把分子变成分母的约数+1.（1）分母约数为2,3=2+1（2）分母约...1Ҳ����