6个a连加可简写成( ),6个a相乘,可以简写成( )。
6a;a6
阅读短文,根据所给的首字母完成单词。
Justin and Paul are at their home when the telephone rings. It's Susan. She lives (1) n_____ in Hill
building. She sees some (2) r_____ there. Then the twins drive to the building at (3) o_____. They
see three men (4) r_____ out of it. The men (5) p_____ the twin brothers into the van and drive
away. Justin and Paul manage (设法) to open the back door of the van and then (6) j_ 6___ out when
it (7) s_____ at the traffic lights. In the police station, they are (8) s_____ to see the three men there
(9) a_____. The police tell them why and they laugh (10) h_____.
在1,2,3,4四个数字中随机选两个不同的数字组成两位数,则组成的两位数大于40的概率是 .