Question

5. Află numerele necunoscute.a)65:5+a×3-39:13=78
Repede​

Answer 1

Răspuns:

a) 65:5+a•3-39:13 = 78

13+3a-3 = 78

10+3a = 78

3a = 78-10

3a = 68

a = 68/3 → = 22,(6)7.

EVERGREEN

Answer 2

Răspuns:

$\bf 65 : 5 + a\cdot 3 - 39 : 13 = 78$

$\bf 13 + a\cdot 3 - 39 : 13 = 78$

$\bf 13 + a\cdot 3 - 3 = 78$

$\bf a\cdot 3 - 3 = 78-13$

$\bf a\cdot 3 - 3 = 65$

$\bf a\cdot 3 = 65+3$

$\bf a\cdot 3 = 68$

$\bf a\cdot 3 = 68$

$\bf a = 68 :3$

$\bf a=22,6$