Question

Numerele a si b sunt direct proportionale cu numerele 0,2 si 2 . Aflato aaceste numere daca a+b=33

Answer 1

Răspuns:

a/0,2+b/2=k

a=0,2k

b=2k

0,2k+2k=33

2,2k=33=>k=33:2,2=>k=15

a=0,2·15=3

b=2·15=30

Answer 2

{ a ; b } d.p { 0, 2 ; 2 }

a / 0, 2 = b / 2 = k

a + b = 33

a / 0, 2 = k => a = 0, 2 k

b / 2 = k => b = 2 k

0, 2 k + 2 k = 33

2, 2 k = 33

k = 33 / 2, 2

k = 15

a = 0, 2 × 15 = 3

b = 2 × 15 = 30