Question

化简2x²+xy²-(y-5x⁴)-[x⁴+1-(x²+2xy³)]后

1. A.
   按x的降幂排列为4x⁴+2xy³+xy²+3x²-y-1
2. B.
   按x的升幂排列为2xy³+3x²+4x⁴+xy²-y-1
3. C.
   按y的降幂排列为2xy³+xy²-y+4x⁴+3x²-1
4. D.
   按y的升幂排列为-1-y+3x²+4x⁴+2xy³+xy²

Answer 1

C