Ai biết giải vòng 3 trong toán violypic trên mạng hông giúp mk với . Mk tk x 5 lun cho
K
Khách
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26 tháng 3 2018
ta có f(x)=ax5+bx3+2014x+1 \(\Rightarrow\)f(2015)=20155a+20153b+2014.2015+1 và f(-2015)=(-2015)5a+(-2015)3b+2014(-2015)+1
\(\Rightarrow\)f(2015)+f(-2015)=20155a+20153b+2014.2015+1+(-2015)5a+(-2015)3b+2014(-2015)+1=2
\(\Rightarrow\)f(2015)+f(-2015)=2 mà f(2015)=2 \(\Rightarrow\)f(-2015)=0 vậy............
NHỚ K CHO ME NHÉ !!!
BT
3
CC
1
13 tháng 8 2018
0,03 : -5/7 - 6,87. 7/5 + 1,1 . ( -1,4 )
= -0,03 . 7/5 -6,87 . 7/5 + 1,1 . ( - 1,4 )
= -7/5 . ( -0,03 - 6,87 ) + 1,1 .( -1,4 )
= -1,4 . -6,9 + 1,1 . ( -1,4 )
= -1,4 . ( -6,9 + 1,1 )
= -1,4 . (-5,8 )
= 8,12
nhớ k và kết bạn vs mik nha
N1
4
4 tháng 8 2018
\(\left|-\frac{2}{5}x-\frac{4}{3}\right|=\left|4x-\frac{5}{6}\right|\)
\(=-\frac{2x}{5}-\frac{4}{3}=4x-\frac{5}{6}\)
\(=-\frac{2x}{5}-\frac{4}{3}=-\left(4x-\frac{5}{6}\right)\)
\(=x=-\frac{5}{44};\frac{65}{108}\)
\(\Rightarrow x=\orbr{\begin{cases}x=-\frac{5}{44}\\x=\frac{65}{108}\end{cases}}\)
AH
4 tháng 8 2018
|−25 x−43 |=|4x−56 |
=−2x5 −43 =4x−56
=−2x5 −43 =−(4x−56 )
=x=−544 ;65108
⇒x=[
| x=−544 |
| x=65108 |
AN
2 tháng 10 2017
Ý bạn là bài này ? : Một vòi nước chảy vào bể, giờ đầu chảy vào được 2/15 bể, giờ thứ hai chảy vào được 1/5 bể. Hỏi trung bình mỗi giờ vòi nước đó chảy vào được bao nhiêu phần của bể ?
Giải
Vòi nước chảy trong 2 giờ được :
2/15+1/5=1/3 (bể)
Trung bình mỗi giờ vòi nước chảy được :
1/3 : 2 = 1/6 (bể)
Đáp sô' : 1/6bể.
TH
26 tháng 12 2017
Almost people say that they prefer living in the peaceful countryside to the noisy city. I agree with them but I can't admit it when I live here-my second hometown-Tay Ninh. Although Tay Ninh is now a city but it's very peaceful and comfortable. I can hardly hear any loud noise and you know, to me, the most peaceful place is my neighborhood.
My family and my neighbors live together on Dien Bien Phu Street. Every morning when I get up, I always can see the sun shining and there are some warm voices from the small beautiful birds and the sounds from my neighborhood. We all get up very early. A new day begins. I often wander around my neighborhood. There are lots of green trees along the streets. There, we can see a range of houses from high to short, ordinary to extraordinary. We all do business. Some neighbors sell foods, drinks and household appliances as grocery stores. Some are tailors who mend clothes, make clothes and mend shoes too. Some are the barbers who cut hair and give make up my mother. Some are bakers who bake cakes in the bakery and sell breads. The environment is never polluted and we can feel the warm atmosphere everytime.
All the inhabitants in my neighbor are very friendly to each other. Whenever a person needs help, the others are always ready to give help and one thing should be mostly appreciated is that they never mind how difficult the work is. And we build such a great consolidation. When a neighbor has just returned from a trip, they always remember to buy the others some beautiful and worthy gifts and we also share the money for parties together. We never underestimate the honor we give each other.
I love my neighborhood very much. I hope that our friendliness and consolidation will last forever and remain unchanged.
26 tháng 12 2017
bài làm :
I live out Tang Tien village .In the neighborhood, I love Ha uncle, the head of the neighborhood kids. Bac Ha is 50 years old, he openeda Recent groceries house.Heis I am tall, eyes bright and cheerful mood. He isvery harmony, interested users, especially is for family.Whenhe of me is self-employed, he talked with the family hearinteresting me and tell me stories. Will people love him because he is a neighbor makingmint kind and gentle.
9 tháng 8 2018
\(=\left(-0,37+\frac{14}{8}\right).\left(-1.1\right)-\left(2,63-\frac{9}{24}\right).\left(-1,1\right)\)
\(=-1,1.\left(-0,37+\frac{14}{8}-2,63+\frac{9}{24}\right)\)
\(=-1,1.\left[\left(-0,37-2,63\right)+\left(\frac{14}{8}+\frac{9}{24}\right)\right]\)
\(=-1,1.\left[\left(-3\right)+\left(\frac{14}{8}+\frac{3}{8}\right)\right]\)
\(=-1,1.\left(-3+\frac{17}{8}\right)\)
\(=-1,1.\left(-\frac{7}{8}\right)\)
\(=\frac{77}{80}\)
cho hỏi lớp mấy vậy bạn ?