meet+sb+at

卓桦豪2100it's+abj+of sb+to do sth
逯秒宇18936246398 ______ 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.)

卓桦豪2100设计一个水槽,其横截面为等腰梯形,要求满足条件AB+BC+CD=a(常数) <ABC=120° 写出横截面积y与腰长x之? -
逯秒宇18936246398 ______ 设腰长为x,横截面积为y 设下底边长AB为m,则由角ABC=120度,可以求出:上底CD边长为:m+x,梯形高为 √3x/2 m+m+x+x=a m=a/2-x y=(m+m+x)*(√3x/2)/2 =√3(a-x)x/4

卓桦豪2100怎么用主语+COST+SB+钱造句 -
逯秒宇18936246398 ______ The bike cost me 200 yuan.这辆自行车花费了我200元

卓桦豪2100meet me at the hotel room是哪首歌的歌词 -
逯秒宇18936246398 ______ 歌手:pitbull pitbull - room service (hotel room)(intro) dj jim jonsin i want everybody to stop what they're doing.now if you know you're with somebody you're gonna take the hotelroom tonight make some noise meet me at the hotelroom.(x4)(chorus) ...

卓桦豪2100用one of+最高级+可数名词复数;It's+adj+for sb+to do sth＂对某人做某事很...＂;so that＂为了＂the other＂两者中的另一个＂;stop sb(from)doing sth、stop... -
逯秒宇18936246398 ______[答案] You must be one of the most dilligent students in your class.It's important for us to protect wild animalsMary started early so that she could catch the first bus to school.I have two brothers.One...

卓桦豪2100后面可以加什么come+up+to+sb+in?come+up+
逯秒宇18936246398 ______ 所谓的to后面加动词现在分词,其实应该是动名词,这里的ving形式等同于名词. 常用的to加原形,是为了构成不定式,既to-infinive

卓桦豪2100请问it is+adj+for sb+to do,有没有it is+adv+for sb+to do呢 -
逯秒宇18936246398 ______[答案] it is+adj.+for sb+to do sth为固定句型,而it is+adv+for sb+to do这种句型是没有的

卓桦豪2100已知a,b,c是非负数,且满足a+b+c=30,3a+b - c=50,求S=5a+4b+2c的最大值和最小值, -
逯秒宇18936246398 ______[答案] 3a+3b+3c=90,3a+b-c=50 两式相加得6a+4b+2c=140 所以S=140-a 由a+b+c=30,3a+b-c=50解得 b=40-2a c=a-10 因为非负数a,b,c 所以40-2a≥0,a≤20, a-10≥0,a≥10 所以10≤a≤20 -20≤-a≤-10 所以120≤N≤130 N的最大值和最小值分别为130和120

卓桦豪2100It's+adj.+of sb+to do -
逯秒宇18936246398 ______[答案] It's+adj.+of sb+to do sth 是一种固定句型表示:某人做某事怎么样例如:It's kind of you to help me .你能帮助我真是太好了.It's silly of him not to forgive others for their mistakes.他不肯原谅别人的过错真...

卓桦豪2100以知a,b,c为3个非负数,且满足3a+2b+c=5,2a+b - 3c=1,若S=3a+b - 7c,试求S的最大值与最小值.(1) - (3),得8c - a=3 7C - A -
逯秒宇18936246398 ______[答案] 3a+2b+c=5 (1) 2a+b-3c=1 (2) (2)*2,得4a+2b-6c=2 (3) (1)-(3),得7c-a=3 a=7c-3 (4) (4)代入(2),得 14c-6+b-3c=1 11c+b=7 b=7-11c (5) so s=3a+b-7c=21c-9+7-11c-7c=3c-2 因为a,b,c为3个非负数 所以7c-3>=0,c>=3/7 7-11c >=0,c