A:go
B:went
C:goes
D:to go
--- What is his room like?
--- It's very messy. There're mountains of dirty clothes everywhere
如图,四边形ABCD是等腰梯形,ADBE是平行四边形.面积等于10,还知道三角形BCE的面积是3,那么三角形CDE的面积是多少?
1)f(x)=2axg(x),(a>0,a≠1);
2)g(x)≠0;
3)f(x)g′(x)<f′(x)g(x)且 f(1)g(1) + f(−1)g(−1) =5,则a=____.