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

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

= 7: (30/48 + 40/48) + (28/9 - 3/9) * 9/100=

= 7/1 * 48/70 + 25/9 * 9/100=

=48/10 + 25/100 = 4,8+0,25 = 5,05

по действиям:

1) 5/8 + 5/6 = 30/48 + 40/48 = 70/48 = 35/24 = 1 11/24

2) 3 1/9 - 1/3 = 28/9 - 3/9 = 25/9 = 2 7/9

3) 7 : 1 11/24 = 7/1 * 24/35 = 24/5 = 4,8

4) 2 7/9 * (3/10) ² = 25/9 * 9/100 = 25/100=0,25

5) 4,8 + 0,25 = 5,05