Question

Dau coroana ex.2,3
Vă rog

Answer 1

Răspuns:

2.

a+b=105

a-b=3b sau a=4b

4b+b=105

5b=105

b=21

a=84

3.

a+b+c=144

c=3b+6

a=(c-b)/2 =>2a=c-b sau 2a=3b+6-b sau 2a=2b+6 sau a=b+3

(b+3)+b+(3b+6)=144

5b=144-9

5b=135 =>b=27

c=3•27+6 =>c=87

a=(87-27)/2 =>a=30