ban+sb+from+doing

隆泳国1793lt is+形容词+for sb或to sb+动词不定式什么情况下用for什么情况下用to? -
雷沾乔13199076894 ______[答案] 1、动词不定式作主语是被动语态时用 to sb 例如:It's a great honour to Mary's birthday partyto be invited. 2、动词不定式作主语是主动语态时用 for sb 例如:It was impossible for lost time to be made up.

隆泳国1793it take me about ten minutes by bike 这句话对吗 我们老师说只能 it+take+sb+时间+to do sth -
雷沾乔13199076894 ______ 这是对的,因为你们老师说的 it takes sb sometime to do sth 中的to do sth在这个句子中没写出来,完整的应该是 it takes me about 10 minutes ( to do sth , 例如 to go home) by bike ,by bike 不属于to do sth 里面的

隆泳国1793(1)若a=4,b的相反数是 - 5,则a - b的值是------.(2)已知a,b互为相反数,m、n互为倒数,|s|=3,求a+b+ -
雷沾乔13199076894 ______ (1)b的相反数是-5,所以b=5,则a-b=4-5=-1;故答案为:-1. (2)∵a,b互为相反数,m、n互为倒数,|s|=3,∴a+b=0,mn=1,s=3或-3,∴a+b+mn+s=0+1+3=4 或a+b+mn+s=0+1-3=-2. 故答案为:4或-2.

隆泳国1793已知a.b互为相反数,且ab不等于0,m,n互为倒数,s的绝对值为3,求b∕a+mn+s的值 -
雷沾乔13199076894 ______ ∵a.b互为相反数,且ab不等于0 ∴b/a=-1 ∵m,n互为倒数 ∴mn=1 ∵s的绝对值为3 ∴s=±3 ∴b/a+mn+s=-1+1+(±3)=±3

隆泳国1793用is+adj+for sb+to do sth造三个句子(含翻译)急!!! -
雷沾乔13199076894 ______ It's hard for him to learn English.学英语对他来说太难了.It's easy for me to pass the exam.对我来说,通过这个考试太容易了.It's helpful for him to do some exercise.锻炼对于他很有帮助

隆泳国1793it's+abj+of sb+to do sth
雷沾乔13199076894 ______ adj是说明sb的品质特点用of sb; 说明to do sth用for sb (说人的用of sb. 说事的用for sb.) It's very nice of you to help me. 你来帮助我,你真是太好了. It's very hard for him to study two languages. 对他来说学两门外语是很难的. 用介词后面的代词作主语,用介词前边的形容词作表语,造个句子.如果道理上通顺用of,不通则用for.如: You are nice. (通顺,所以应用of). He is hard. (人是困难的,不通,因此应用for.)

隆泳国1793赋值语句是非常重要的语句,以下书写错误的是( ) -
雷沾乔13199076894 ______[选项] A. a=3 B. S= a+b+c 2 C. N=N+1 D. 3_6=x

隆泳国17932、下面程序输出结果是 def f(*b): s=0 for item in b: s += item retur...
雷沾乔13199076894 ______[答案] 依题意,S={x|-1如果a与b∈S,那么-1要证a*b∈S,就是要证明-1(a*b+1)(a*b-1) =[ (a+b)/(1+ab)+1] [ (a+b)/(1+ab)-1] =[a+b-1-ab] [a+b+1+ab]/(1+ab)² =[(a-1)(1-b)] [(a+1)( b+1)] /(1+ab)² 因为-10,a+1>0,b+1>0,所以上式小于0,故原命题得证