Question

Aflati numerele a, b stiind ca raportul lor este 0,6 iar 2a + 3b = 42

Answer 1

Răspuns:

a/b=0,6-->a=0,6b

2a+3b=42-->2×0,6b+3b=42--->1,2b+3b=42-->4,2b=42-->b=10

a=0,6×b=0,6×10=6

Answer 2

Răspuns:

a/b=0,6=>a/b=6/10=>a/b=3/5=>5a=3b

2a+3b=42

2a+5a=42

7a=42=>a=42:7=>a=6

12+3b=42=>3b=42-12=>b=3:3=>b=10