(2x²+ax-y+6)-(2bx²-3x+5y-1)
=2x²+ax-y+6-2bx²+3x-5y+1
=(2-2b)x²+(a+3)x-6y+7
若不含X,
则2-2b=0,a+3=0,
∴b=1,a=-3谢谢了