Observe as expressões a seguir:
1) 10y-10x
2) -3x²-5y+10
3) 5+x-(5x-2)
4) (2x+3y).(2x-3y)

dentre estas expressões a que representa o produto notável é
(A) 1.
(B)2.
(C)3.
(D)4.
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