7: (5/8+5/6)+(3 целых 1/9-1/3) *(3/10 во 2ой степини)

7:(5/8+5/6)+(3 1/9-1/3) *(3/10)²=5 1/20

1) 5/8+5/6= 30/48 + 40/48= 70/48
2) 7: 70/48= 7* 48/70= 48/10=24/5= 4 4/5
3) 3 1/9-1/3= 2 10/9 - 3/9= 2 7/9= 25/9
4) 25/9* (3/10)²= 25/9 * 9/100= 1/4
5) 4 4/5 + 1/4= 4 16/20 + 5/20= 4 21/20= 5 1/20