Объясните,, подробно: (2/7+(1/2)²+3/4) : 1 1/7

(2/7 + (1/2)² + 3/4) : 1 1/7 = 1 1/8,

1) (1/2)² = 1/4,
2) 2/7 + 1/4 + 3/4 = 2/7 + 4/4 = 2/7 + 1 = 1 2/7,
3) 1 2/7 : 1 1/7 = 9/7 : 8/7 = 9/7 * 7/8 = 9/8 = 1 1/8