计算题：（1）（-2xy2）3（2）（-2x）o（3x2y）（3）-（x2）3-x4ox2（4）0+(-12)-2÷|-2|（5）（3x2y-2x+1）（-2xy）（6）．
（1）原式=-8x3y6；（2）原式=-6x3y；（3）原式=-x6-x6=-2x6；（4）原式=1+4÷2=3；（5）原式=-6x3y2+4x2y-2xy；（6）原式=x2-xy-3xy+y2=x2-xy+y2．
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扫描下载二维码13x40x14mm-14x42x14mm With Brass Bail Mixed Agate Pendants976235
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Jewelry Type:
Pendants or Charms
Place of Origin:
China (Mainland)
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Pendants or Charms Type:
Fashion Pendant
Jewelry Main Material:
Fashion Pendant
Anniversary,Engagement,Gift,Party,Wedding
13x40x14mm-14x42x14mm
Mixed Agate Pendants
Packaging & Delivery
Packaging Details:
PP or carton also according to customer's requirements
Delivery Detail:
15-20 Days
13x40x14mm-14x42x14mm With Brass Bail Mixed Agate Pendants976235
Material :
& 13x40x14mm-14x42x14mm
Min.Order :
We can offer the following kinds of OEM & ODM service for you:
1.Produce according to your samples or design:
Customer can send samples to our company freely, we will make items exactly same as your sample. If you have any request to make some changes, please also tell us, we can produce according to your requirement.
Here is our address:
Milky Way Jewelry
12A-09 Room, Building 1, No21 Shun san tiao, Song Zhuang Road, Fengtai Zone,100079 Beijing, China
TEL:86-10-39955
Customer also can send us the drawing picture of your design with the request of size, material, color and so on, we will produce sample and quote to you in about one week.
2.Design and produce according to your idea:
If you have a good idea of the products, welcome to tell us the deta our designer will design several samples for you accordingly, so we can choose the best one from them. If you are not satisfied with samples, please give us advice for changes, we will reproduce until you satisfied.
3.Produce for your brand:
Once the products and design are confirmed, you can send us the logo of your brand in clear picture with the size and color request, and confirm the place where the logo should be on the products, we can produce for your brand specially.
Milky Way Jewelry ( Gets )
was established in 2000, a professional manufacturer which is especially producing various kinds ofBeads,
Rhinestone Jewelry
, glass beads ,lampwork beads, pearl,gemstone,
European jewelry
,Jewelry Findings
etc., and dealing in full set of finished jewelry product (Necklace,Earrings,Pendant,Bracelet
etc ) export business.
As a professional
Jewelry findings
company , our factory owned 6 different production departments, 150 professional technicians and 1800 employees at present. We can, therefore, guarantee to provide our customers with competitive prices, prompt delivery and different products.
Equipped with years of experience, computerized equipment and strict quality control, We promises per beads or findings check up by our quality control team , Ensure the excellent quality of our products.Thousands of our products are widely distributed to more than 60 countries and areas all over the world. You can visit our website to get more updated information or contact us directly, we feel for sure that you will find one or more items that attract you! We look forward to cooperating with you and seeking a joint development, your relative enquiry will get a prompt response from us.
&& We promise to:
Offer jewelry findings and finished jewelries with the most competitive price.
Streamline the buying and paying process.
Deliver goods to our customers all over the world with speed and precision.
Ensure excellent quality of our products.
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aisn-detail求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 =(1/2x^2-0.5x^2)+(0.25x-1/4x)+(0.2x^3-1/5x^3)+0.5x-1=0.5x-1=0.5*12/13-13/13=-7/13
1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1
=1/2x^2-0.5x^2+0.25x-1/4x+0.2x^3-1/5x^3+0.5x-1（把X次方相同的项放在一起，调整相关数及其符号的位置）
=(1/2x^2-0.5x^2)+(0.25x-1/4x)+(0.2x^3-1/5x^3)+0.5x-1（全是加减法，两两合并计算）
=(0.5x^2-0.5x^2)+(0.25x-0.25x)+(0.2x^3-0.2x^3)+0.5x-1（1/2=0.5；1/4=0.25；1/5=0.2）
=0+0+0+0.5x-1
=0.5*12/13-13/13
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化简得：0.5x-1带入x=12/13值为-7/13
(1/2x^-0.5x^2)-(1/4x-0.25x)+(0.2x^3-1/5x^3)+0.5x-1
两两抵消，只剩下0.5x-1
1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1=0.5x-1 =0.5*12/13-13/13=-7/13
扫描下载二维码0.56x12.5和1.6x25还有3.28x4x0.25的简便方法_百度知道
0.56x12.5和1.6x25还有3.28x4x0.25的简便方法
6x25=(0.8x12.28x(4x0.7x0.56x12.28x1=3.25)=3.4x4)x25=0.7x10=7 1.5=（0.28x4x0.7x(0.25=3.8)x12.5=0.4x100=40 3.5)=0.4x(4x25)=00
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出门在外也不愁已知函数f（x）=x4-2x3+3m，x∈R，若f（x）+9≥0恒成立，则实数m的取值范围是（　　）A. m≥B. m＞C. m≤D. m＜
因为函数f（x）=x4-2x3+3m，所以f′（x）=2x3-6x2．令f′（x）=0得x=0或x=3，经检验知x=3是函数的一个最小值点，所以函数的最小值为f（3）=3m-．不等式f（x）+9≥0恒成立，即f（x）≥-9恒成立，所以3m-≥-9，解得m≥．故答案选A．
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要找m的取值使f（x）+9≥0恒成立，思路是求出f′（x）并令其等于零找出函数的驻点，得到函数f（x）的最小值，使最小值大于等于-9即可求出m的取值范围．
本题考点：
函数恒成立问题；利用导数求闭区间上函数的最值．
考点点评：
考查学生找函数恒成立问题时的条件的能力．
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