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(6a-4b)^2
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Răspuns :

(6a-4b)²=(6a-4b)(6a-4b)=
36a²-24ab-24ab+16b²=
36a²-48ab+16b²=
4(9a²-12ab+4b²)=
4(3a-2b)²
(x-y)²=x²-2xy+y²
x=6a
y=4b

(6a-4b)²=6²a²-2(6a×4b)+4²b²

=36a²-2(24ab)+16b²

=36a²-48ab+16b²

=4(9a²-12ab+4b²)

(6a-4b)²=4(9a²-12ab+4b²)=4(3a-2b)²