原式=(x+y)(x-y)
=(3+1+3-1)[(3+1)-(3-1)]
=23×2
=43.
根据句意,用括号内所给单词的适当形式填空。
1. She bought a ________(bath) suit last Sunday.
2. I like doing some ________(shop) at weekends.
3. She hasn’t ________(feed) the cat yet.
4. There are about ten ________(well) in that village.
5. Has the camera been________(pack) yet?
老王和老伴育有两儿一女,女儿已结婚,大儿子已工作,小儿子还在上大学。由于父母去世得早,老王年轻时除了养育自己孩子,还需要养育自己的亲弟弟,如今弟弟已事业有成,生活富裕。现如今老王得了重病,需要人照顾。关于老王的赡养和扶养问题,下列说法不正确的是()。
A.老伴有扶养的义务
B.弟弟有扶养的义务
C.大儿子和小儿子有赡养的义务
D.女儿由于已出嫁没有赡养的义务