Помогите пж по матем

$2) \: ( {2}^{5} + 19) \div 3 - {5}^{2} \times {3}^{3} \div 45 =$
(32+19):3-25×27:45=
51:3-675:45=
17-15 = 2

Ответ: 2

$3) \: {11}^{2} - ( {5}^{3} - {6}^{2} \times {3}^{3} \div {9}^{2} ) =$
121-(125-36×27:81)=
121-(125-972:81)=
121-(125-12)=
121-113 = 8

Ответ: 8

${2}^{5} \times {7}^{2} \div 56 - ( {10}^{2} - 79) =$
32×49:56-(100-79)=
1568:56-21=
28-21=7

Ответ: 7