Question

aflati valoarea necunoscutei: 5+5×{[5+5×(a-5)]:5-5}=15
cum se rezolva?​

Answer 1

Răspuns: a=11

Explicație pas cu pas:

5+5×{[5+5×(a-5)]÷5-5}=15

5×{[5+5×(a-5)]÷5-5}=15-5

5×{[5+5×(a-5)]÷5-5}=10

[5+5×(a-5)]÷5-5=10÷5

[5+5×(a-5)]÷5-5=2

[5+5×(a-5)]÷5=2+5

[5+5×(a-5)]÷5=7

5+5×(a-5)=5×7

5+5×(a-5)=35

5×(a-5)=35-5

5×(a-5)=30

a-5=30÷5

a-5=6

a=6+5

a=11

Verificare:

5+5×{[5+5×(11-5)]÷5-5}=15

5+5×[(5+5×6)÷5-5]=15

5+5×[(5+30)÷5-5]=15

5+5×(35÷5-5)=15

5+5×(7-5)=15

5+5×2=15

5+10=15