Can you help me... Thank you so much
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\(x\times\dfrac{20}{11}=\dfrac{1}{1}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{11}\\ x\times\dfrac{20}{11}=\dfrac{10}{11}\\ \Rightarrow x=\dfrac{1}{2}\)
Ta có :
=> X x 20/11 = ( 1 - 1/3 ) + ( 1/3 - 1/5 ) + ( 1/5 - 1/7 ) + ( 1/7 - 1/9 ) + ( 1/9 + 1/ 11 )
=> X x 2/11 = 1 - 1/11 = X x 1/11 = 11/11 - 1/11
=> X x 20/11 = 10/11
=> X = 10/11 : 20/11
=> X = 1/2
a) | x+5|+3=7
|x+5|=4
=> x+5=4
Hoặc x+5=-4
=>x thuộc { -1 ; -9}
Vậy x thuộc { -1 ; -9}
b) 25 - | x| =10
=> |x|=15
=> x thuộc { 15 ; -15}
Vậy c thuộc { 15 ; -15}
Hãy sắp xếp những câu sau thành hai bài hội thoại hợp lí:
P1
(1)Could you do me a favor, please?
(2)Sure. What can i do for you?
(3)Yes. Could you show me to the nearest bus-stop?
(4)Certainly. Go ahead. Take the second turning on the left. It's on the way.
(5)Thank you. i'm sure i'll find it.
P2
(1)Do you need my help?
(2)Can you help me remove this motorbike? It's on the way.
(3)No problem. i'll help you.
(4)Thank you very much. That's very kind of you.
COMPUTER
Computer is a modern tool which has made life very easy and simple. It has the capability to complete more than one task in small time. It is able to do work of many human beings alone within less time. It is the utility of highest efficiency. The first computer was a mechanical computer which was created by the Charles Babbage. A computer works successfully using its hardware and fully installed application software. Other accessories of the computer are keyboard, mouse, printer, CPU and UPS.
The data which we put into the computer using device is called input data and device as input device and data which we take outside using printer or the other device is called as output data and device as output device. The input data gets changed into the information which can be stored and changed anytime. Computer is very safe tool for data storage which is being used in various fields. We can shop, pay our electricity bill, water bill, video chat, messaging, e-mail messages anywhere in the world and lots of online activities using the internet.
VD:
- Khi không khí là chất cách điện: Bình thường khi ta đứng gần ổ điện, ta không bị điện giật. Điều đó chứng tỏ không khí ở điều kiện bình thường là chất cách điện
- Khi không khí là chất dẫn điện: Khỉ các đám mây giông phóng điện xuống đất (hiện tượng sét đánh) thì không khí khi đó là chất dẫn điện