Question

Va rog,ajutati-ma!Dau coroana!

Answer 1

4.(x:4+5)×3-1=20/+1
(x:4+5)×3=21/:3
x:4+5=7/-5
x:4=2/×4
x=8

5.a=Suma lui Mihai
b=Suma Alunei
a+b=100
a=4b
4b+b=100
5b=100/:5
b=20
a=20×4
a=80

Answer 2

4. (x:4+5)×3-1=20
(x:4+5)×3=20+1
(x:4+5)×3=21
(x:4+5)=21:3
(x:4+5)=7
(x:4)=7-5
(x:4)=2
x=2×4
x=8

5. Mihai |-----|
}100 lei
Alina |-----|-----|-----|-----|
Mihai=100:5
Mihai=20
Alina=20×4
Alina=80
Verificare: 20+80=100
80:20=4