Question

dau 15 puncte + coroană ​

Answer 1

Explicație pas cu pas:

a) a/3 = 5/8 → 8a = 5 × 3 → 8a = 15

a = 15/8

b) 5/a = b/9

ab = 5 × 9 = 45

45 - ab = 45 - 45 = 0

c) x/y = 2/5 ; y = 15

⇔ x/15 = 2/5

5x = 2 × 15

5x = 30 → x = 30 : 5 = 6