求大神帮忙解题啊,越快越好!感激不尽_作业帮
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求大神帮忙解题啊,越快越好!感激不尽
求大神帮忙解题啊,越快越好!感激不尽
二、填空2. 如果是3次方则是 -6,2次方的话就是 -4 （看不清楚）3. [-4,5] & （是f(x)还是f'(x)?)4. 25. 16. 0三、求极限&= lim (x-2)(x-1)/ (x-1)(x+1)约掉 = lim (x-2)/(x+1)代入 = (1-2)/(1+1) = -1/22.&=lim(1+ 1/2 * 2/x)^(x/2)= e^(1/2) & &(根号e)3. = lim sin5x/5x * 3x/tan3x * 5/3&等价无穷小 = 5/34. （看不清,是x-&1么）洛必达 &= 1/(x*1)代入 & & = 1四、求导&y' = 1/2 * (a^2+x^2) * (-1/2) * (0 + 2x)f'(x) = (1-sinx)'*(1+sinx)-(1-sinx)(1+sinx)' / (1+sinx)*(1+sinx)&&&&&& = -cosx*(1+sinx)-(1-sinx)*cosx/&(1+sinx)*(1+sinx)&&&&代入得 = 0五、微分dy = 1/(2-x) *(-1)dx = 1/(x-2)dxdy = [e^(-3x)]'*cos2x + e^(-3x)*(cos2x)'& & &= e^(-3x)*cos2x*(-3)+e^(-3x)*(-sin2x)*2六、不定积分∫xd(e^x)= x*e^x-∫e^xdx =&&x*e^x -e^x= -∫cosx^2d(cosx)= -1/3*cosx^3七、定积分 （太难写了）设 根号x= t,则x= t^2,当x=0时,t=0;当x=1时,t=1= 2-2ln2看不清上限.积出来是 = x*sinx+cosx (代入上限即可）八、&x=e时,y=e&&&&&&&&y' = lnx+1 ,x=e时,y'= 2&&&&-1/y' = -1/2&&&&&&&&则切线方程： y-e = 2(x-e)&&&&&&&&& &法线方程： y-e = -1/2(x-e)&&&&&&&&&&&&&& &急！！！四级快到了！求帮忙修改一篇四级英语作文吧！感激不尽！！！_百度知道
急！！！四级快到了！求帮忙修改一篇四级英语作文吧！感激不尽！！！
急！！！四级快到了！求帮忙修改一篇四级英语作文吧！感激不尽！！！这是我写的一篇四级英语作文，求高人帮我看一下，帮我找出其中写错的地方和表达不够地道或准确的地方，总之就是找出你不满意的地方就行了，然后再把你的写法写在下面给我参考就可以了！四级快到了！急啊，大家帮帮忙吧！感激不尽！！！Living alone or Living with roommates ?
Written by Zhao LeeWhen asked about college students should live alone or live with roommates ,different students will have different preferences .Some students choose to live alone ,while others would rather live with roommates.Those students who make the former choice believe living alone can make them enjoy more peace and quiet. Besides,they argue ,under such peaceful conditions ,they can focus their attention on their own study easily ,learning efficiently and gain more knowledge .However ,still other students choose to live with roommates. From their perspectives , college career includes
not only learning but also how to cope with other people .In addition ,they hold the point that living with roommates is convenient for them
to make friends with each other
.As to me ,I am inclined to live with roommates sinc旦法测盒爻谷诧贪超楷e I am not good at fitting in with other peers and dorm life may benefit me .Furthermore ,I can get immediate help from students around me when I alone can not handle a matter .Given these factors ,I think I’d better live with roommates.
提问者采纳
When asked about college students should live alone or live with roommates ,different students will have different preferences.Some students choose to live alone ,while others would rather live with roommates.（用while的时候尽量保持两个句子的时态一致，因为while有隐含的同时发生的意思，但这是个小问题）Those students who make the former choice believe （书面语中最旦法测盒爻谷诧贪超楷好不要省略that，因为要引导句子）living alone can make them enjoy more peace and quiet.（没有错误但是有些拗口，can，make这样的动词范围太大，适当换成更为精致的动词） Besides,they argue（that） ,under such peaceful conditions ,they can focus their attention on their own study easily ,learning（与前后动词保持平行用learn） efficiently and gain more knowledge .However ,still other students choose to live with roommates. From their perspectives , college career includes
not only learning but also how to cope with other people.（英语讲求美的平行，not only..but also...后面接平行的形式会使句子更为漂亮，如not only how to...but also how to...） In addition ,they（这个代词指代得也太远了～直接用名词更好） hold the point that living with roommates is convenient for them（指代不清楚，有指代roommates的歧义）
to make friends with each other.（用other classmates更清晰）As to me ,I am inclined to live with roommates since I am not good at fitting in with other peers and dorm life may benefit me .Furthermore ,I can get immediate help from students around me when I
alone can not handle a matter（alone放到句末） .Given these factors ,I think I’d better live with roommates.很大的问题没有。如果是四级的话应该是还可以的吧。个人觉得代词用得太多，使得中间部分很模糊，说了那么多他们他们他们，谁知道指的是什么呢？能用名词的时候尽量用名词要显得清楚简洁得多。恩。
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其他4条回答
你还不如让你同学帮你看一下，这种问题估计没人会，会的人没时间
不要用太多长句，容易出错，一旦错了，就扣分的
臃肿了，要简短明了。
怎么问这个作文，难道是今年的考题？
四级英语的相关知识
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出门在外也不愁帮帮忙吧！补起一下吗！咋个做啊。帮帮忙，快快快，谢谢。各位亲们？帮帮忙_百度知道
帮帮忙吧！补起一下吗！咋个做啊。帮帮忙，快快快，谢谢。各位亲们？帮帮忙
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提问者采纳
Eat hamburger
I like to eat the fish and soup
I like eat some vegetables
I like drink some milk
I like to eat some beef and soup
I like eat some fruit because lt good at my healthy
提问者评价
你的回答完美的解决了我的问题，谢谢！
来自：作业帮
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其他3条回答
一点看不懂啊？
确定是对的
当然，老师教的！
不信算了。
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出门在外也不愁