设奇函数f(x)在上具有连续导数，则()
Many_______willbeopenedupinthefutureforthosewithauniversityeducation．
________withthesizeofthewholeearth,thehighestmountainsdonotseemhighatall.
设二次型f(x1,x2)=x12+4x1x2+4x22经正交变换化为二次型，求ab的值。
Q表示产量,成本C(Q)=100+13Q，单价p，需求量Q(p)=800/P+3-2则工厂取得利润最大时的产量为_____
