Question

Va rog...orice dar macar ceva

Answer 1

Răspuns:

9 a egal cu 10 b=> b/a=9/10

Answer 2

1. a/b=1/3

a=5

5/b=1/3

b=15

a+b=5+15=20

2. a=2 1/2

a=5/2

a=2,5

b=0,5

a/b=2,5/0,5=5

3. x/y=2/3

x=2k

y=3k

(3x-y)/(x+y)=(3×2k-3k)/(2k+3k)=(6k-3k)/5k=3k/5k=3/5=0,6