Question

aflați numerele a, b, c știind ca :a+b=50, b+c=60, a+b+c=90​

Answer 1

Răspuns:

Explicație pas cu pas:

a+b+c=90

a+b=50

b+c=60

Rezolvare:

c=90-50 => c=40

b=60-40 => b=20

a=50-20 => a=30

Verificare: 40+20+30=60+30=90

Answer 2

Răspuns:

a = 30

b = 20

c = 40

Explicație pas cu pas:

$\it a+b = 50\\\\b+c= 60\\\\a+b+c = 90\\\\inlocuim\: pe\: a+b\: in\: ultima\: relatie\\\\50+c = 90 \Rightarrow c = 90 -50\Rightarrow \boxed{\it c=40}\\\\b+40 = 60 \Rightarrow b = 60-40\Rightarrow \boxed {\it b=20 }\\\\a+20 = 50\Rightarrow a = 50-20\Rightarrow \boxed{\it a = 30}\\\\Verificare:\\\\30+20+40 = 90\:(adevarat)$