Question

Помогите плиииииииииииииз

Answer 1

512.
9/25 × 5 = 9/25 × 5/1 = 9/5 = 1 4/5
S = а × в
S = 9/25 × 1 4/5
S = 1 44/125

513.
1) 2
2) 3/10
3) 2
4) 2 1/2
5) 15
6) 2/5
7) 2 16/19
8) 10
9) 20