Question

Afla necunoscutele,a,b,c,d din egalitatile b-a=139 b+c=677 c+d=450 d-121=299

Answer 1

b-a=139

b+c=677

c+d=450

d-121=299⇒d=420

c+d=450⇒c+420=450⇒c=30

b+c=677⇒b+30=677⇒b=647

b-a=139⇒647-a=139⇒a=647-139⇒a=508

Answer 2

Răspuns

Explicație pas cu pas:

d - 121 = 299

d = 299 + 121

d = 420

___________

c + d = 450

c + 420 = 450

c = 450 - 420

c = 30

______________

b + c = 677

b + 30 = 677

b = 677 - 30

b = 647

______________

b - a = 139

647 - a = 139

a = 647 - 139

a = 508