1+1=3 ai nhanh minh tick
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21 tháng 2 2018
\(\frac{2x-1}{-3}=\frac{x+5}{2}\Rightarrow2\left(2x-1\right)=-3\left(x+5\right)\)
\(\Rightarrow4x-2=-3x-15\)
\(\Rightarrow4x+3x=-15+2\)
\(\Rightarrow7x=-13\)
\(\Rightarrow x=\frac{-13}{7}\)
LT
3
26 tháng 3 2019
1x15/2x15=15/30
2x10/3x10=20/30
3x6/5x6=18/30
chúc học tốt
16 tháng 4 2018
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.
hok tốt ~
16 tháng 4 2018
cái này là mình phát minh chứ ko phải là cái có do người khác phát minh nhé bạn
MV
1
12 tháng 3 2017
\(s=\frac{1}{3}+\frac{1}{3^2}+\frac{1}{3^3}+....+\frac{1}{3^{2015}}\)
Suy ra : \(3S=1+\frac{1}{3}+\frac{1}{3^2}+....+\frac{1}{3^{2014}}\)
Nên \(3S-S=1-\frac{1}{3^{2015}}\)hay \(2S=1-\frac{1}{3^{2015}}\)Khi đó S =\(\frac{1}{2}-\frac{1}{3^{2015}.2}\)
Vậy ..................
LT
14
VÌ 1chiếc + 1 đôi =3 chiếc
1 cái +1 cái đôi =3 cái