Question

spune daca propozitiile de mai jos sunt adevarate.a) DACA a-b=3784, atunci (a+1720)-(b+1720)=3784;b) daca  a-b=2715,atunci (a-820)-(b-820)=2715; c) daca a-b=1214, atunci (a+500)-(b-500)=1214(( URGENT VA ROG ))    VERIFICA RASPUNSUL DAT , EFECTUAND CALCULATOARELE

Answer 1

a) a-b=3784
(a+1720)-(b+1720)=3784    ⇒
a+1720-b-1720=3784      ⇒a-b=3784    adevarat
b) (a-820)-(b-820)=2715
a-820-b+820=2715  ⇒
a-b=2715    adevarat
c)  (a+500)-(b-500)=1214
a+500-b+500=1214
a-b+1000=1214
a-b=1214-1000
a-b=214   fals