2(a²b+ab²)-1-2ab²+2
=2a²b+2ab²-1-2ab²+2
=2a²b+1
=2×(-2)²×1+1
=9
1/4(-4x²+2x-8)-(1/2x-1)
=-x²+1/2x-2-1/2x+1
=-x²-1
=-(1/2)²-1
=-5/4
2(a²b+ab²)-1-2ab²+2
=2a²b+2ab²-1-2ab²+2
=2a²b+1
=2×(-2)²×1+1
=9
1/4(-4x²+2x-8)-(1/2x-1)
=-x²+1/2x-2-1/2x+1
=-x²-1
=-(1/2)²-1
=-5/4