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efectuati (25-b)(25+b);
(√30-t)(√30+t);


Răspuns :

(25-b)(25+b)=25²-b²=625-b²
(√30-t)(√30+t)=(√30)²-t²=30-t²
(25-b)(25+b)=25 la patrat x b la patrat (formula matematica)
Cea dea doua formula exact asa
(√30-t)(√30+t)=√30 la a doua xt la a doua=30xt(deoarece √30 la a doua =30)