Răspuns:
∑40-(a-4)x7):2=6
40-(a-4)x7=6x2
40-(a-4)x7=12
(a-4)x7=40-12
(a-4)x7=28
a-4=28:7
a-4=4
a=4+4
a=8
Explicație pas cu pas:
Salutare!
[40-(a-32:8)×7]:2=6
[40-(a-4)×7]:2=6
[40-(a-4)×7]=6×2
40-(a-4)×7=12
(a-4)×7=40-12
(a-4)×7=28
(a-4)=28:7
Verificare:
[40-(8-32:8)×7]:2=
[40-(8-4)×7]:2=
(40-4×7):2=
(40-28):2=
12:2=
6✔
