这道这道数学题怎么做?

来源：蜘蛛抓取(WebSpider) 时间：2015-08-02 13:06 标签： 这道题真难
瓦li（）这道题怎么做？_百度知道
瓦li（）这道题怎么做？
提问者采纳
亲，几声啊。
亲，这个词是这个：瓦砾wǎ lì破碎的砖瓦，但主要是小石头，碎石头的意思。
那这个呢？阴hui（）也是四声
阴晦，应该是这个。
得无楚之水土使善盗耶？是什么意思
啊，文言文哈，意思是：难道是楚国的水土使得百姓善于偷盗么？
提问者评价
太给力了，你的回答完美解决了我的问题！
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瓦砾（wǎlì）~~~~~~~~~~~~~~~~~~~~~~~~~~&(￣︶￣)&回答满意请采纳~ →_→谢谢，祝你学习进步~
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出门在外也不愁这道题怎么做：阅读理解.
In the mid-1940s, the young ambitious Ruth and Elliot Handler, owned a company that made wooden picture frames. In 1945, Ruth and Elliot joined their close friend Harold Mattson to form a com_作业帮
这道题怎么做：阅读理解.
In the mid-1940s, the young ambitious Ruth and Elliot Handler, owned a company that made wooden picture frames. In 1945, Ruth and Elliot joined their close friend Harold Mattson to form a com
这道题怎么做：阅读理解.
&&&& In the mid-1940s, the young ambitious Ruth and Elliot Handler, owned a company that made wooden picture frames. In 1945, Ruth and Elliot joined their close friend Harold Mattson to form a company that
would be known for the most famous and successful doll ever created. This company would be named
Mattel after Mattson and Elliot. &&&& &In the mid-1950's, while visiting Switzerland, Ruth Handler purchased a German Lilli doll. Lilli was a shapely, pretty fashion doll first made in 1955. She was originally fashioned after a famous cartoon character
in the West German Newsletter, Build.
&&&& Lilli is the doll that would inspire Ruth Handler to design the Barbie doll (芭比娃娃). With the help of her technicians and engineers at Mattel, Barbie was born. Ruth then hired Charlotte Johnson, a fashion designer, to create Barbie's wardrobe. It was in 1958 that the patent for Barbie was obtained. This would be a fashion doll unlike any of her time. She would be long-limbed (长肢的), shapely, beautiful, and only 11.5 inches tall. Ruth and Elliot would name their new fashion doll after their own daughter, Barbie.
&&&& In 1959, the Barbie doll would make her way to the New York Toy Show and receive a cool reception from the toy buyers.
&&&& Barbie has undergone a lot of changes over the years and has managed to keep up with current trends in hairstyles, makeup and clothing. She is a reflection of the history of fashion since her introduction to the toy market.
&&&& Barbie has a universal appeal and collectors both young and old enjoy time spent and memories made with their dolls.
1. What can we know about Barbie from the passage?
A. She was fashioned after a famous cartoon character.
B. She reflects the history of fashion.
C. She was first made in 1958.
D. She was Ruth's daughter's doll.
2. When Ruth and Elliot created the first doll, _____.
A. they had learned about the toy market
B. they asked a fashion designer to help
C. the doll had a universal appeal
D. the doll had created a promising market
3. The Barbie doll is well received because _____.
A. she is always keeping up with fashion
B. she stands for the toy tendency
C. she is popular with children
D. she has a large market in the world
4. Which is the best title for this passage?
A. Barbie Doll-Symbol of Fashion
B. Barbie Doll-Toy of New Time
C. Current Trend of Barbie Doll
D. Birth and Popularity of Barbie Doll这道数学题怎么做?_百度知道
这道数学题怎么做?
改进技术后，现在需要1800元做一批零件，做这批零件原来需要多少元，成本降低12分之3
提问者采纳
设做这批零件原来需要x元;12)=2400(元)答;12)x=1800(3&#47：做这批零件原来需要2400元。(1- 3&#47。 列方程解;4)x=1800x=2400做这批零件原来需要2400元算术方法：1800÷(1- 3&#47
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3=2400做这批零件原来需要2400元;12）==1800÷（1-3&#47
设这批零件原来需要x元 (1-3/12)x=1800 3/4x=1800 x=2400
/12) = 2400
x(1-3/12)=1800,解之得：x=2400元、
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这道题怎么做？
f(x)=x^2-mInx,h(x)=x^2-x+a
（1）当a=0时，f(x)&=h(x)在(1,无穷大)上恒成立，求实数m的取值范围
（2）当m=2时，若函数k(x)=f(x)-h(x)在[1,3]上恰有两个不同零点，求实数a的取值范围。
设函数f(x)=x^2-mInx,h(x)=x^2-x+a
（1）当a=0时，f(x)&=h(x)在(1,无穷大)上恒成立，求实数m的取值范围
解：x^2-mInx&=x^2-x,x∈（1，+∞），
∴lnx&0,m&=x/lnx,记为g(x),
g'(x)=[lnx-1]/(lnx)^2,由g'(x)=0得x=e,
g(x)|min=g(e)=e,
∴m&=e,为所求。
（2）当m=2时，若函数k(x)=f(x)-h(x)在[1,3]上恰有两个不同零点，求实数a的取值范围。
解：k(x)=x^2-2lnx-(x^2-x+a）=x-a-2lnx,
k'(x)=1-2/x,由k'(x)=0得x=2.
k(x)|min=k(2).
k(x)在[1,3]上恰有两个不同零点，
&==&{k(2)=2-a-2ln2&0,
{k(1)=1-a&=0,
{k(3)=3-a-2ln3&=0.
&==&{a&2-2ln2,
{a&=3-2ln3.
∴2-2ln2&a&=3-2ln3,为所求。
大家还关注这道题怎么做：We must read between_百度知道
这道题怎么做：We must read between
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We must read between the lines, and sometimes _____&nbsp, to fully u
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