Question

va rog ex 3 dau coroana​

Answer 1

a+b

______ = 11

2

(a+b) : 2 = 11

a= b+8

Scriem din nou ecuatia stiind ca a=b+8

(b+8+b):2=11

(2b+8):2= 11

De aici facem metoda mersului invers.

2b+8=11×2

2b+8=22

2b= 22-8

2b= 14

b=14:2

b=7

a=b+8

a=7+8

a=15