Question

afla valoarea numarului a din urmatorul exercițiu 100 -[2+(4 +a:2×5):3]×9= 10​

Answer 1

100 - [ 2 + ( 4 + a : 2 × 5 ) : 3 ] × 9 = 10

[ 2 + ( 4 + a : 2 × 5 ) : 3 ] × 9 = 100 - 10

[ 2 + ( 4 + a : 2 × 5 ) : 3 ] × 9 = 90

2 + ( 4 + a : 2 × 5 ) : 3 = 90 : 9

2 + ( 4 + a : 2 × 5 ) : 3 = 10

( 4 + a : 2 × 5 ) : 3 = 10 - 2

( 4 + a : 2 × 5 ) : 3 = 8

4 + a : 2 × 5 = 8 × 3

4 + a : 2 × 5 = 24

a : 2 × 5 = 24 - 4

a : 2 × 5 = 20

a : 2 = 20 : 5

a : 2 = 4

a = 4 × 2

a = 8