Question

Matematica clasa a V a:
2kg mere si 7kg portocale costa 34 lei.
Cat costa 1kg de mere si 1kg portocale, daca 5kg de mere si 1kg portocale costa 19 lei...

Answer 1

Răspuns:

7

Explicație pas cu pas:

Notam: x-mere, y-portocale

2m+7p=34

5m+1p=19 => 1p=19-5m

2m+7(19-5m)=34

2m+133-35m=34

133-34=35m-2m

99=33m => m=99/3 => m=3

1p=19-5m => 1p=19-5×3 => 1p=19-15 => p=4

m+p=3+4=7