(2x²+ax-y+b)-(2bx²+3x+5y+1)
=2x²+ax-y+b-2bx²-3x-5y-1
=2x²-2bx²+ax-3x-5y-y+b-1
=(2-2b)x²+(a-3)x-6y+b-1
值与字母x的值无关,则
2-2b=0
a-3=0、
解得a=3 b=1
于是
3a³-2b³-(4a³-3b³)
=3a³-2b³-4a³+3b³
=-a³+b³
=-3³+1³
=-27+1
=-26
(2x²+ax-y+b)-(2bx²+3x+5y+1)
=2x²+ax-y+b-2bx²-3x-5y-1
=2x²-2bx²+ax-3x-5y-y+b-1
=(2-2b)x²+(a-3)x-6y+b-1
值与字母x的值无关,则
2-2b=0
a-3=0、
解得a=3 b=1
于是
3a³-2b³-(4a³-3b³)
=3a³-2b³-4a³+3b³
=-a³+b³
=-3³+1³
=-27+1
=-26