Question

Dau coroana daca rezolvati exercitiile cu fractii

Answer 1

Răspuns:

Explicație pas cu pas:

a/b = 4/9

a = 4b/9

7a + b = 28b/9 + b = 28b/9 + 9b/9 = 37b/9

9 + 6b = ?

probail era 9a + 6b = 36b/9 + 6b = 4b + 6b = 10b

(7a + b)/(9a + 6b) = 37b/9 : 10b = 37/90

______________

2(4a + 9) = 3(5b + 6)

8a + 18 = 15b + 18

8a = 15b

a/b = 15/8