(a-1).(a+3) < 0
ai đúng mình sẽ tik cho
K
Khách
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TK
2
21 tháng 9 2017
A = 1/2 - 1/4 - 1/8 -...- 1/512 - 1/1024
2A = 2(1/2 - 1/4 - 1/8 -...- 1/512 - 1/1024)
2A = 1 - 1/2 - 1/8 -...- 1/1024 - 1/2048
2A - A = 1 - 1/2 - 1/8 -....- 1/1024 - 1/2048 - (1/2 - 1/4 - 1/8 - ...- 1/512 - 1/1024)
A = 1 - 1/2048
A = 2047/2048
Em mới học lớp 6, vậy anh thua em rồi. HIHI
GN
TÌm GTNN của biểu thức :
A = l x-2 l + l x+8 l
ai nhanh và đúng mình sẽ tik cho nha, mình đang gấp quá
2
TN
19 tháng 7 2016
Kuri:bạn sai 1 lỗi rất lớn đó là x ko thể nhận cùng lúc 2 giá trị vs bài này ta nên dùng BĐT |a|+|b|>=|a+b|
\(\left|x-2\right|+\left|x+8\right|\ge\left|x-2-8-x\right|=10\)
\(\Rightarrow A\ge10\)
Dấu = khi ab>=0 =>(x-2)(x+8)>=0 =>2=<x=<8
Vậy...
16 tháng 12 2016
Nếu p=1 thì: 4p+1 = 4.1+1=5 chia hết cho 5
: 2p+3 = 2.1+3=5 chia hết cho 5
Vậy số nguyên dương p nhỏ nhất là 1
9 tháng 1 2018
In the school yard children, every 2 each session details are to recess. A drum up, but as fun loudly urging us quickly run out .... romp.
Wide school yard a few minutes ago that, deserted and quiet suddenly as narrow, not even enough room for noise and hundreds of large and small pupils, from Grades flush profusely as massive streams, multi-colored sharp. Shuttlecock few top men quickly occupied, arrayed, foot stone Thoan, mouth à á call each other, red and blue orbs flying over, fly back, flew up, fly down. Many girls playing jump rope rhythmically and healthy, spinning wire spiraling, undulating dancer with a smile, hair flying in the wind. Original few eagles around women with women, men with men, many of you are playing tag, chasing people who flee flashed bucket to run, the purple ears. Some you jokes huddled storytelling fun, laughing, with him jumping happily cheered! Many couples holding hands, walking around, talking to small giggle. Some make you curious to look at the fence looking around she sold plots vicious looking sour apricot, deep sweetness. Teacher observations, standing afar off, would also spread the fun out of our joy.
Recess filled with laughter and voices wa also go very fast. A solemn drumbeat sounded. Drumming a miracle that we had a hundred silent gradually, rushed into the classroom, the school returned to the air, quiet terrace, its tranquility..
9 tháng 1 2018
At twenty-five past nine, the bell rings and all the students go into the yard. It's time for recess. They are all happy and exited. They mêt their friends and have some fun. Many are talking about the last class or last movie. Some are eating and drinking as well as chatting. Some students are playing games blindman's bluff or catch. Some boys are playing marbles and some girls are skipping rop. But the most popular activity is talking. The yard is very noisy until the bell rings. Then everyone goes indoors and classes begin again
VT
6
CT
15 tháng 1 2019
có 2 TH
Th1: a-2 <0 và a+3>0
suy ra -3<a<2(tm)
TH2:a-2>0 và a+3<0
suy ra 2<a<-3(ktm)
vậy -3<a<2
4 tháng 5 2017
30,25 - 25% + 3/4:0.01=30,25 + 0,25+0,75:0.01=30,25+0,25+75=30,5+75=105,5
\(\Leftrightarrow\)\(\orbr{\begin{cases}\hept{\begin{cases}a-1>0\\a+3< 0\end{cases}}\\\hept{\begin{cases}a-1< 0\\a+3>0\end{cases}}\end{cases}}\)
(a-1).(a+3) < 0
\(\Leftrightarrow\orbr{\begin{cases}a-1< 0;a+3>0\\a-1>0;a+3< 0\end{cases}}\Leftrightarrow\orbr{\begin{cases}a< 1;a>-3\\a>1;a< -3\left(voly\right)\end{cases}}\)
\(\Leftrightarrow-3< a< 1\)
Vậy với mọi a thỏa mãn -3<a<1 thì (a-1).(a+3) < 0