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Ai formulele (a-b)(a+b) = a²-b²
(a+b)² = a²+2ab+b²
(a-b)² = a²-2ab+b²
a) (7y+8a)(7y-8a) = 49y²-64a²
b) (5x-√7y)(5x+√7y) = 25x²-7y²
c) (5y-3b)(5y+3b) = 25y²-9b²
d) (0,6a+√2b)(0,6a-√2b)= 0,36a²-2b²