2x(2x-1)+4x(x^2-x-1)-4(1-2x^2),其中x=-2
=4x²-2x+4x³-4x²-4x-4+8x²
=4x³-6x-4
=-32+12-4
=-24
（a+3)（4a-1）-2(3+a)(2a+0.5),其中a=-3
=4a²+11a-3-4a²-13a-3
=-2a-6
=6-6
=0