Question

Verificați egalitățile, stabilind valoarea de adevăr a fiecăreia:
a) 6²+7²=(6+7)²
b) 11³-10³=(11-10)³
c) 3²+4²=5²
d) 4+5²=6²
e) 3³+4³+5³=6³
f) 8²-7²=(8-7)(8+7)

Answer 1

a. 6²+7²=36+49=85;
[6+7]²=13²=169;
⇒85=169⇒fals;
b. 11³-10³=1³=1⇒11³-10³=1⇒fals;
c. 3²+4²=9+16=25=5²⇒adevarat;
d. 4+5²=4+25=29;
6²=36⇒29=36⇒fals;
e. 3³+4³+5³=27+64+125=216;
⇒6³=216;
⇒216=216⇒adevarat;
f. 8²-7²=64-49=15;
1·15=15;
⇒15=15⇒adevarat;