1/2-1/7=5/14,(5/14)÷4=5/56,则每一个分数减去前一个分数的差是5/56:
1/7+5/56=13/56,
13/56+5/56=18/56=9/28,
9/28+5/56=23/56,
23/56+5/56=28/56=1/2.
所以答案:
1/7,13/56,9/28,23/56,1/2
1/2-1/7=5/14,(5/14)÷4=5/56,则每一个分数减去前一个分数的差是5/56:
1/7+5/56=13/56,
13/56+5/56=18/56=9/28,
9/28+5/56=23/56,
23/56+5/56=28/56=1/2.
所以答案:
1/7,13/56,9/28,23/56,1/2