圆形溜冰场的一周全长是150米,如果沿着这一圈每隔15米安装一盏灯,一共需要装______盏灯.
根据题意可得:
150÷15=10(盏).
答:一共需要装10盏灯.
故答案为:10.
设x,y∈R+,且满足x+4y=40,则lgx+lgy的最大值为 ( )
A.40
B.10
C.4
D.2
下列各句中均有一处错误,每处错误仅涉及一个单词的增加、删除或修改。
增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。
删除:把多余的词用斜线(\)划掉。
修改:在错的词下划一横线,并在该词下面写出修改后的词。
注意:每处错误及其修改均限一词。
小题1:There is many trees in front of my house now.
小题2:Jack is always late with school.
小题3:After supper, we went to home.
小题4:Tom has already learnt two thousands English words until now.
小题5:It is believed that December 21st, 1891, the first basketball game in history was played.