1 1/2×1 1/3×1 1/4×1 1/5×1 1/6-1/2

1 1/2·1 1/3·1 1/4·1 1/5·1 1/6-1/2=01) 3/2·4/3·5/4·6/5·7/6=7/22) 7/2-1/2=7-1/2=6/26/2(значит 6:2) 6/2=3ответ:3