Question

Gaseste nr de forma abcde care sa indeplineasca conditiile:
a+b= 9
a+b+c=15
a+b+c+d+e=20
e= c-b
a+b+c+d=19

Answer 1

a+b+c=15; a+b=9, rezulta ca 9+c=15, c=6

idem, d+e=5

(a+b+c+d)+e=20 devine 19+e=20, deci e=1

d+e=5, d=5-e=5-1=4; d=4

e=c-b, deci b=c-e=6-1=5; b=5

a+b=9, a=9-b=9-5=4 deci a=4

(a+b+c)+d=19 devine 15+d=19, deci d=4

R: a=4, b=5, c=6, d=4, e=1