Question

如果x²与-2y²的和为M，1+y²与-2x²的差为N，则2M-4N化简后应为

1. A.
   -6x²-8y²-4
2. B.
   10x²-8y²-4
3. C.
   -6x²-8y²+4
4. D.
   10x²-8y²+4

Answer 1

A