Question

90+{24÷12×[20-5×(49÷9-36÷6)×a]}=100​

Answer 1

Răspuns:  a = 3

Explicație pas cu pas:

90 + { 24 : 12 × [ 20 - 5 × (49 : 7 - 36 : 6 ) × a ] } = 100​

2 × [ 20 - 5 × ( 7 - 6) × a ] = 100 - 90

2 × ( 20 - 5 × 1 × a) = 10

20 - 5 × a = 10 : 2

5 × a = 20  - 5

5 × a = 15

a = 15 : 5

a =3