根据一元二次方程的根与系数的关系,得
x1+x2=-3,x1x2=-2.
则原式=x1+x2x1x2=32.
Many officials call for global cooperation to ________ some"real security threats" the world is facing. [ ]
A. pick up
B. give away
C. deal with
D. take over
什么叫放空炮?