Question

下列各式中，错误的是

1. A.
   (a-2x)²＝a²+4x²-4ax
2. B.
   (x+y)²＝x²+2xy+y²
3. C.
   (x-2y)²＝x²-2xy+4y²
4. D.
   (-a-2x)²＝a²+4ax+4x²

Answer 1

C