A:①②
B:③④
C:①③
D:②③
2x+55的展开式中,x2的系数等于40,则∫0aex+2xdx等于( )
在网格上,平移△ABC,并将△ABC的一个顶点A平移到点D处,
—Excuse me, can I get to the zoo?
—Go this street about 100 meters, and you'll find it on your right.