Question

Va rog spunetimi si mie [(a+3)x3+3]x3+3=102

5x a:3=2525
Repedeeeeeeeee!!!

Answer 1

[(a+3)x3+3]x3+3=102

b+3 =102

b=99

[(a+3)x3+3]x3=99

cx3=99

c=99/3=33

(a+3)x3+3=33

d+3=33

d=30

(a+3)x3=30

a+3=30/3=10

a+3=10

a=10-3

a=7

5x a:3=2525

5xa =2525x3

5xa=7575

a=1515

Answer 2

[ ( a + 3 ) x 3 + 3 ] x 3 + 3 = 102

 [ ( a + 3 ) x 3 + 3 ] x 3 = 102 - 3

[ ( a + 3 ) x 3 + 3 ] x 3  = 99

( a + 3 ) x 3 + 3 = 99 : 3

( a + 3 ) x 3 + 3 = 33

( a + 3 ) x 3 = 33 - 3

a + 3 = 30 : 3

a + 3 = 10

a = 10 - 3

a = 7 → numarul necunoscut

___________________________

5 x a : 3 = 2 525

5 x a = 2 525 x 3

5 x a = 7 575

a = 7 575 : 5

a = 1 515