解1原式=9X+6X^2-3X+2X^2=8X^2+6X将X=-2代入,得8*4-6*2=32-12=20解2原式=a^2b-ab-ab^2-ab+2ab^2+2ab=a^b+ab^2将a=-1/2b=2代入得(-1/2)^2*2+(-1/2)*2^2=1/2-2=-3/2
