Question

a×4+b×4=200
(a-b)×3=60
a=?
b=?

Answer 1

Răspuns:

Explicație pas cu pas:

a × 4 + b × 4 = 200

4 × ( a + b ) = 200

a + b = 200 : 4

a + b = 50 → suma celor doua numere

_____________________________

( a - b ) × 3 = 60 → triplul diferentei

a - b = 60 : 3

a - b = 20 → diferenta

_____________________

a = b + 20

( b + 20 ) + b = 50

2 × b = 50 - 20

b = 30 : 2       ⇒      b = 15

a = 15 + 20     ⇒      a = 35

Answer 2

a × 4 + b × 4 = 200 | : 4

a + b = 50

( a - b ) × 3 = 60

a - b = 60 : 3

a - b = 20

a = 20 + b

20 + b + b = 50

20 + 2 × b = 50

2 × b = 50 - 20

2 × b = 30

b = 30 : 2

b = 15

a = 20 + 15

a = 35