给出下列五个命题:
①函数y=f(x),x∈R的图象与直线x=a可能有两个不同的交点;
②函数y=log2x2与函数y=2log2x是相等函数;
③对于指数函数y=2x与幂函数y=x2,总存在x0,当x>x0 时,有2x>x2成立;
④对于函数y=f(x),x∈[a,b],若有f(a)•f(b)<0,则f(x)在(a,b)内有零点.
⑤已知x1是方程x+lgx=5的根,x2是方程x+10x=5的根,则x1+x2=5.
其中正确的序号是____ .
选词填空。
building,relax,arrive,take,excited
I'm Zhou Qin.Sometimes I go out to____when I feel tired.Last week,I visited a small village.
I____at the village in the morning.It was cold but i was very____.My friend,Li Guang,met me at the station and we walked towards an old____.We watched some pictures on its walls and I____some photos.I wanted to write about those pictures.
今天象棋中有“炮”与“砲”二字。唐代的象棋中使用“砲”字,宋代的象棋中“炮”“砲”二字开始并用,这一变化说明
形近字组词
精____ 剧____ 裕____
清____ 刷____ 浴____
写出下列字母的小写形式。
G ____