fight+like+cats+and+dogs

姚浩青3019They++fight+a+lot中为何不用They++usualy++fight
田固庙18346056523 ______ 这两个意思是有区分的.第1句表达的是他们非常努力的意思,但换成第2句就不是那个意思了.

姚浩青3019已知a>0,b>0,c>0且abc=1,求证:1/a+1/b+1/c+3/(a+b+c)>=4 -
田固庙18346056523 ______ 前面两个都不对,有点儿难. 令A=1/a,B=1/b,C=1/c;A>0,B>0,C>0; 则ABC=1/(abc)=1;1/a+1/b+1/c+3/(a+b+c)=A+B+C+3/(1/A+1/B+1/C)=A+B+C+3(ABC)/(BC+AC+AB)=A+B+C+3/(AB+BC+AC)(A+B+C)^2=A^2+B^2+C^2+2*(AB+BC+AC) 因为:2*(A...

姚浩青3019It is generally accepted that [ ] boy must learn to stand up and fight like [ ] manA a aB a theC the theD a /为什么选A不选D,零冠词不是也表泛指么? -
田固庙18346056523 ______[答案] a boy == any boy no matter who he is a man == a man as he has seen around him

姚浩青3019It is generally accepted that [ ] boy must learn to stand up and fight like [ ] man -
田固庙18346056523 ______[选项] A. a a B. a the C. the the D. a /选什么 为什么?

姚浩青3019abc属于实数,a²+b²+c²=1求证|a+b+c|≤根号3 -
田固庙18346056523 ______ 证明: 因为 (a-b)²≥0得: a²+b²≥2ab; 同理可得: b²+c²≥2bc c²+a²≥2ac 上面三式相加得: 2(a²+b²+c²)≥2(ab+bc+ac); a²+b²+c²≥ab+bc+ac; ab+bc+ac≤1; (|a+b+c|)² =a²+b²+c²+2ab+2bc+2ac =1+2(ab+bc+ac)≤1+2•(1)=3 即证:|a+b+c|≤√3.

姚浩青3019(a+b+c)的立方等于多少? -
田固庙18346056523 ______ (a-b-c)^3 =(a^2-ab-ac-ab+b^2+bc-ac+bc+c^2)*(a-b-c) =(a^2+b^2+c^2-2ab-2ac+2bc)*(a-b-c) =a^3-(a^2)b-(a^2)c+a(b^2)-b^3-(b^2)c+(a^2)c-b(c^2)-c^3-2(a^2)b+2a(b^2)+2abc-2(a^2)c+2abc-2b(c^2)+2abc-2(b^2)c-2b(c^2) =a^3+b^3+c^3-3(a^2)b+3a(b^2)+3a(c^2)-3(b^2)c-3b(c^2)+6abc

姚浩青3019fight是动词吗? -
田固庙18346056523 ______[答案] vi. 1.打仗;搏斗;打架;奋斗 You have to fight for your rights. 你必须为你的权利而奋斗. England and France fought against Russia in the Crimean War. 在克里米亚战争中,英、法两国与俄国作战. 2.争吵[(+over/about)] He and his wife are always ...

姚浩青3019如果a,b,c是非零数(1)求a/|a|+b/|b|+c/|c|+abc/|abc|的值 (2)本题采用的数学 -
田固庙18346056523 ______ a>0,b>0,c>0,值=4 abc中有一个负的,两个负的,值=0 abc都小 于0,值=-4

姚浩青3019Fight for you .jason deluro的中英歌词 -
田固庙18346056523 ______ [Chorus] It's gonna take a lot to drag me away from you There's nothing that a hundred men, or more, could ever do Just like the rain, down in Africa It's gonna take some time but I know you're worth fighting for - I'd fight for you Hey ba bum ba eh ba ...

姚浩青3019英语问题74strugglefightbeat的区别. -
田固庙18346056523 ______[答案] struggle KK:[] DJ:[] vi. 1.奋斗;斗争[(+for/against/with)][+to-v] They struggled for peace. 他们为和平而战. The old man has ... The struggle between the two teams was hard. 这两个队之间的斗争很艰苦. 2.努力;使劲;挣扎[(+for)] 3.难事 fight KK:[] ...