только 1/2

1/2 в квадрате = 1/4

2^2=4>2

(3/7)^2=9/49. 3/7-9/49=21/49-9/49=12/49, 9/49<3/7

(1/2)^2=1/4.  1/4<1/2

1 1/7=8/7. (8/7)^2=94/49. 64/49-8/7=64/49-56/49=8/49, 64/49>8/7

Т. е это числа 3/7 и 1/2