Question

Verifica daca propozitiile urmatoare sunt adevareate :
a) Daca a+b=13 500, atunci (a+1 350)+(b-1 350)=13 500 b) Daca a-b =100 000,atunci (a+10 000)-(b-10 000)=100 000

Answer 1

a) (a+1350)+(b-1350)=13500
Deschidem parantezele
a+1350+b-1350=13500
a+b+1350-1350=13500
a+b=13500 Adevărat

b) (a+10000)-(b-10000)=100000
a+10000-b+10000=100000
a-b+10000+10000=100000
a-b+20000=100000
a-b=100000-20000
a-b=80000. Fals