-3 . (x2 - 5) < 0
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LH
20 tháng 8 2016
Có: \(\frac{a}{b}< \frac{c}{d}\Leftrightarrow ad=bc\)
\(\Leftrightarrow ad+ab< bc+ab\)
\(\Leftrightarrow a\left(b+d\right)< b\left(a+c\right)\)
\(\Leftrightarrow\frac{a}{b}< \frac{a+c}{b+d}\) (1)
Tương tự: \(ad< bc\)
\(\Leftrightarrow ad+cd< bc+cd\)
\(\Leftrightarrow d\left(a+c\right)< c\left(b+d\right)\)
\(\Leftrightarrow\frac{a+c}{b+d}< \frac{c}{d}\) (2)
Từ (1) và (2) suy ra: \(\frac{a}{b}< \frac{a+c}{b+d}< \frac{c}{d}\left(dpcm\right)\)
BB
3
29 tháng 12 2019
Ta có: \(|-x-5|=|1-5|\)
<=> \(|-x-5|=4\)
<=>\(\orbr{\begin{cases}x-5=4\\x-5=-4\end{cases}}\)
<=>\(\orbr{\begin{cases}x=9\\x=1\end{cases}}\)
Vậy x=1 hoặc x=9
20 tháng 3 2020
a) (x2-1)(x2-4)<0
=> x2-1 và x2-4 trái dấu nhau
Ta thấy: x2 >=0 với mọi x => x2-1 > x2-4
=> \(\hept{\begin{cases}x^2-1>0\\x^2-4< 0\end{cases}\Leftrightarrow\hept{\begin{cases}x^2>1\\x^2< 4\end{cases}\Leftrightarrow}\hept{\begin{cases}x>\pm1\\x< \pm2\end{cases}}}\)
=> Không có giá trị củ x thỏa mãn đề bài
4 tháng 6 2021
saiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
20 tháng 2 2020
2x-5=(-17)+12
2x-5=-5
2x=-5+5
x=0:2
x=0
20 tháng 2 2020
\(2x-5=(-17)+12\)
\(2x=(-17)+12+5\)
\(2x=0\)
\(x=0\)
Vậy \(x=0\)
H
2
VM
2 tháng 5 2018
I was fortunate to begin my day camp career at Ramaquois as a four year old in 1984. I can clearly remember my first bus ride to camp, sitting next to my older sister. Stepping off of the bus, and into a new, strange world, there was no way I could comprehend how important that moment was for me. Ramaquois would become my summer home until this day.
My first summer at day camp was definitely a new experience for me. I had never had a “bunk” or a “cubby” before. My counselors sort of reminded me of my pre-school teachers, but they were… different somehow… I didn't usually enjoy new things and I was slow to warm up to camp. From what my parents tell me, my counselors were very (infinitely) patient with me.When I needed a friend, a counselor was there. When I needed words of encouragement, they chimed in. When I was too shy to ask, they offered help.
I don't remember the specific moment when things changed, but I know that at some point that summer, things just became different. I couldn't wait for the bus to arrive in the morning. I dreaded the weekends. And on the last day of camp, I cried – just the first day. I was hooked. Ramaquois was a part of my life.
I spent 11 summers as a camper at Ramaquois. I had no idea that those summers were just the beginning. I remained at camp for seven years as a counselor, five years a division leader and now I am lucky enough to be an assistant director working with the most unique and talented administrative team in the summer camp industry. I am one of the lucky people that truly enjoys going to work each and every day.
People often ask me why I love camp so much. I usually reply that Ramaquois is not a typical day camp. There is a palpable energy here – a spirit that permeates every activity, every acre, every camper and every staff member. Truly though, the real reason might be those vivid memories of my first summer at camp – the fear of the unknown that turned into love for a new home. My counselors did an amazing job making me feel comfortable and welcomed. Our group became a real family. Many of the boys in that group stayed at camp together, and we “graduated” from Ramaquois at the age of 15.
When I became a counselor, I was amazed to see my camp story repeated over and over again right before my eyes. Every summer, campers would step into a new, mysterious world. Each one came to Ramaquois with their own individual fears, hopes and expectations. Within a few days, the fears were always replaced with friends, and I had the privilege of watching children enjoy the same experience that I had as a camper. Many of them are now counselors, and the cycle repeats itself over and over.
It is this tradition that makes Ramaquois a unique day camp. And it is why this place is special for me, and so many others.
3 tháng 5 2018
We have been to many places but where I summer camp .
I go with My , Ha , Linh .At frist , we went to Linh to make food for a day . At the end , she panics for the kitchen so she does not go . So , i and Ha go together . After packing , we go fishing . She has 3 fish , i have 2 fish . She smiled and said :" I think it's okay ! " . We took five fish to the camp and continued to walk . She smiled and sad : " I to play this , it is so rewarding "!. At lunch , we had lunch . After eating , we sad talking . She always told me a bout the fun . Meanwhile , we were bored and went around . I said :" cold tonight , I want to warm "!. So we decided to find firewood . I picked up some dry sks ,too. She found dried leaves . Our should should fish and happy!
* [ Ko dịch ] , thực hiện lời hứa
19 tháng 2 2017
a) | x - 5 | < 5
=> \(\left[\begin{matrix}x - 5\:=5\\x\:-5\:=-5\end{matrix}\right.\)
=> \(\left[\begin{matrix}x=10\\x\:=0\end{matrix}\right.\)
\(-3\left(x^2-5\right)< 0\)
mà -3<0
nên \(x^2-5>0\)
hay \(x\in\left(-\infty;-\sqrt{5}\right)\cup\left(\sqrt{5};+\infty\right)\)