Question

Aflați numărul d , stiind că: a+25=45 b=a+2 c=a+b .a+b+c-d=4

Answer 1

a+25=45⇒a=45-25⇒a=20

b=a+2⇒b=20+2=22

c=a+b⇒c=20+22=42

a+b+c-d=4⇒a+b+c-4=d⇒20+22+42-4=80

Raspuns: d=80

Answer 2

Răspuns:

a=45-25=20

b=20+2=22

c=20+22=42

20+22+42-d=42+42-d=4

42-d=4-42

42-d=-38

-d=-38-42

-d=-80|×(-1)

d=80