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A). (2x-y)²-(x-2y)²
b). (a+b)²-(b+c)²
c). 49x²-(y+8x)²
d). (5a-3b)²-25a4; (25a4 = 25a la puterea 4)
e). (-2a²+3b)²-4a4; (4a4 = 4a la puterea 4)
f). b6 - (x-4b³)²; (b6 = b la puterea 6)