1.if a =4,b=5 ,what's the answer to the question "a+2ab+1=?请

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1.if a =4,b=5 ,what's the answer to the question "a+2ab+1=?请问这句中的 to是针对的意思吧,不是不
定式结构,
2.our school playground is ()
A fifty metres-long B fifty metre long C fifty metres long D fifty-metre long 选完后请回答：如果要用连字符表达那正确的表达应是：
3.in our class there are 20 girls ,and () are boys.
A other students B the other students C others students D the others studentss 另,and 在此句中怎样译?
4.Mr Smith comes from London,Now he is in China .he is a teacher .he teachers (）a middle school .
A on B in C at D from,选完后请回答,in 和 at 的区别.

不定式指的是to+动词原形,如to do sth.；本句中to后面是名词,所以to是介词,意思是“（针）对...”
此题从语法角度看选C、D均可.若需连字符,则选D.记住：数词和单位名词之间用连字符连起来是单位名词用单数.50-meter；3-inch等.
选B.the other表示二选一时的另一个（些）.and此处译作“而”.
选C.通常情况下,in +较大的地点名词,如国家,省份,城市；in Beijing,in Shenzhen,in Hebei等；at+较小的地点名词,如at home,at the park,at school等.
再问： our school playground is () A fifty metres-long B fifty metre long C fifty metres long D fifty-metre long 您说选D也对，那为什么不是这样表达的 fifty-metre -long ,就像：Millie is an eleven-year-old girl.
再答：数词-名词-形容词这种结构一般用于名词前面，也就是说后面要接名词，Millie is an eleven-year-old girl.但Millie is eleven years old.或Millie is a girle of leven years.均可，但不能Millie is eleven-year-old.

1.if a =4,b=5 ,what's the answer to the question "a+2ab+1=?请 if a=3 b=-4,what is the answer to the question a+2ab+1? If a=3 and b =4,what's the answer to the probiedm:a+b+1=?The What's the answer __the question?A.with B.on C.of D.to 为什么? If a ＝3 and b＝4,what's the answer to the problem ：a＋b＋1＝?the Are you _ the answer to the question?A.sure B.sure to be C.s Pay attention to y=ax^2+bx+c(a≠0), and answer the question. If A=9,B=6,C=4,D=24,E=3,what is the answer to this sum writt if you want to answer the teacher's question,what should you If you want to answer the teacher's question, what should yo 1、My friend ( )the answer to the question.A is know B know C What's meaning of "answer to the question"