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suma a 3 nr. naturale pare consecutive este 90. Aflati nr.

Răspuns :

Pai:

a+b+c=90

b=a+2

c=a+4

a+a+2+a+4=90

3a+6=90

3a=90-6

3a=84

a=84:3

a=28             b=28+2=30              c=28+4=32

a+b+c=90
90:3
a=30
b=30*2
b=60
c=60+30
c=90
90+60+30=90+90=180