in+a+regular+basis

@亢丹4400:Im trying to make our Conversation in a regular b -
伯洋13497999450…… 基本没有语法错误,只是基本不用regular basis 你可以将basis改成base

@亢丹4400:in+——+地点(如Washington D.C), A、/ B、the 求专业人士解答!!! -
伯洋13497999450…… 地点如果确定,并且比较有名,用in the____(地点),如果不确定,指某个地点,(如a school、a haspital等),就直接用in+_____(地点),像如果接的地点是Washington D.C,意思是华盛顿,是独一无二的,故因用in the____,选B.记得采纳哦,祝你的英语越来越好!^_^o~ 努力!

@亢丹4400:In(a+b)=? -
伯洋13497999450…… lna*lnb

@亢丹4400:(2/2)in(a+b)的值 -
伯洋13497999450…… sin(3pai/4+b)=sin(pai/2+pai/4+b)=cos(pai/4+b)=5/13 sin(pai/4+b)=12/13 cos(pai/4+a)=-3/5 sin(pai/4+a)=4/5 所以cos(pai/2+a+b)=cos(pai/4+a)cos(pai/4+b)-sin(pai/4+a)sin(pai/4+b)=-63/65 sin(a+b)=63/65

@亢丹4400:证明:(1+a)In(1+a)+(1+b)In(1+b)<(1+a+b)In(1+a+b)(0小于a小于b) 用中值定理(微积分题) -
伯洋13497999450…… f(x)=x*lnx f'(x)=lnx+1(1+a+b)In(1+a+b)-(1+b)In(1+b)=f(1+a+b)-f(b)=f'(ξ)a 其中ξ在[1+b,1+a+b]中.f'(ξ)a>f'(1+a)*a=(ln(1+a)+1)*a=aln(1+a)+a>aln(1+a)+ln(1+a) 得证.最后一步用到a>0是,a>ln(1+a).这是显然的.如果要证的话,就是求导.

@亢丹4400:已知tan(a+b)=2tan a 证明 3sinb=sin(2a+b) -
伯洋13497999450…… 要证3sinB=sin(2A+B) 即证3sin(A+B-A)=sin(A+B+A) 即证3sin(A+B)cosA-3cos(A+B)sinA=sin(A+B)cosA+cos(A+B)sinA 即证2sin(A+B)cosA=4cos(A+B)sinA 即证tan(A+B)=2tanA 由已zhidao知条件,得证.

@亢丹4400:英语造句①A+谓语+the最n in/of②A+谓语+one of the最+in③A+谓语+the 最+n,A,B,n,C造句,再加④A+谓语+序+最+n+of/n - 作业帮
伯洋13497999450…… [答案] Amy got the highest grades in her class. She is one of the best dancers in team. I am the laziest boy.

@亢丹4400:∫ln(x+a)/(x+b)dx -
伯洋13497999450…… 答:∫In(x+a)/(x+b)dx=∫[(In(x+a)-In(x+b)]dx=∫In(x+a)dx-∫In(x+b)dx=(x+a)[In(x+a)-1]-(x+b)[In(x+b)-1]+C=(x+a)In(x+a)-(x+b)In(x+b)+b-a+C C是常数.这里说一下,∫In(x+a)dx=∫In(x+a)(x)'dx=xIn(x+a)-∫{[In(x+a)]'*x}dx=xIn(x+a)-∫[x/(x+a)]dx=xIn(x+a)-∫[1-a/(x+...

@亢丹4400:已知cosa=1/3,cos(a+b)=1 求证cos=(2a+b)=1/3 -
伯洋13497999450…… cos(2a+b)=cos[a+(a+b)]=cosacos(a+b)-sinasin(a+b) 由于cos(a+b)=1,所以sin(a+b)=0 将cosa=1/3,cos(a+b)=1,sin(a+b)=0代入cosacos(a+b)-sinasin(a+b)=(1/3)*1=1/3 故cos=(2a+b)=1/3

@亢丹4400:问一道SAT2化学题Which sample demonstrates particles arranged in a regular geometric pattern?A CO2(g) B CO2(s) C CO2(l) D CO2(aq) E none of the ... - 作业帮
伯洋13497999450…… [答案] 同学,连college board都会犯错误的..(而且还不愿承认)...这种题目,考试错了不要紧的..我考的时候没做完,物化都还是满分.印象没有的,要坚决跳过...

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