Răspuns :
Răspuns:
a/b= 7/10 , 7b= 10a
b =a +27
7(a+27=10a
7a+ 189=10a
3a=189
a= 63
b=90
2. a/b =3/5, 5a=3b, a=3b/5
3a+2b=38
3×3b/5+2b= 38
9b/5+2b=38
9b+10b= 190
19b=190
b=10
5a=30
a=6
Răspuns:
a/b= 7/10 , 7b= 10a
b =a +27
7(a+27=10a
7a+ 189=10a
3a=189
a= 63
b=90
2. a/b =3/5, 5a=3b, a=3b/5
3a+2b=38
3×3b/5+2b= 38
9b/5+2b=38
9b+10b= 190
19b=190
b=10
5a=30
a=6