Question

x+y=20 d.p cu 2 si 3(d.p=direct proportionale)​

Answer 1

Răspuns:x=8,y=12

Explicație pas cu pas:

x,y d.p 2,3⇒x/2=y/3=K

x/2=k⇒x=2k

y/3=k⇒y=3k

x+y=20

2k+3k=20

5k=20

k=4

x=2k⇒x=2·4=8

y=3k⇒y=3·4=12

Answer 2

x+y=20

x/2=y/3=k

x=2k

y=3k

2k+3k=20

5k=20

k=20:5

k=4

a=2×4

a=8

b=3×4

b=12