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Từ bài toán, ta có sơ đồ:
Nữ: |------|------|------|
Nam: |------|------|------|------|
a) Giá trị mỗi phần bằng nhau là:
\(18:3=6\left(em\right)\)
Số học sinh nam lớp đó là:
\(6×4=20\left(em\right)\)
b) Lớp đó có số học sinh tất cả là:
\(18+20=38\left(em\right)\)
Đáp số: a) \(20em\)
b) \(38em\)
a) Bài giải
Nửa chu vi hình chữ nhật đó là:
100 : 2 = 50 ( cm )
Chiều dài hình chữ nhật đó là:
50 - 10 = 40 ( cm )
b) Diện tích hình chữ nhật đó là:
40 x 10 = 400 ( cm2)
Đáp số: a) 40 cm
b) 400 cm2
Sry, I'm in grade 8
Animal is everwhere on this planet, different animal have other own abilities and their own helpful to our planet and human. Some kind can jump high, some can run fast, some can even have some ridiculous thing that we probably never thing about.
If I could be an animal, how cool it could be! Beisde of all the choices, I would rather chooser to become a wolf, I was always loved someday I could enjoy myself in a form of a wolf since 4 years ago. However I also could be wolf and dragon at the same time but dragon is a legendary animal so maybe in my sight, it didn't count as a kind of animal.
Why wolf, wolf present for loyalty, best of teamwork and powerful kind. Actually I have all of that abilities, I usually be the leader when doing team-work projects and usually gets high score on it, I stayed perky though the night until that work finished perfectly. For the powerful side I recently didn't really have it, although I still have enough for now.
The second reason, I am a furry. I didn't found out about this community until half a year ago and I apparently joined the community due to the fact that I enjoyed it very much, I knew that I was literally a furry since I was a kid because like I loved fluffy and furry things.
Third, although I'm good being 'an alpha' in my own pack, however I'm an introvert, I rather being a lonely wolf than a pack wolf, I feel weird whenever I stand before a bunch of people, so I love staying inside with myu own hobbies.
Being as a free wolf running in the wild, how cool that would be... being free in the wild, you can do whatever you wanted, even some activities you've done to yourself. How could be cooler is I could hunt other animals in a form of a wolf, or I could make a pack and enjoy it only for myself, I could run super fast, doing things that I've ever wanted to do, I love it if this wish could happen some days...
\(\left(2x+1\right)^2-9=0\)
\(\Leftrightarrow\left(2x+1\right)^2=9\)
\(\Leftrightarrow\left(2x+1\right)^2=3^2\)
\(\Leftrightarrow\left(2x+1\right)=3\)
\(\Leftrightarrow2x=3-1\)
\(\Leftrightarrow2x=2\)
\(\Leftrightarrow x=1\)
Vậy x = 1
Ta có:
\(\left(2x+1\right)^2-9=0\)
\(\Leftrightarrow\left(2x+1\right)^2=0+9\)
\(\Leftrightarrow\left(2x+1\right)^2=9\)
\(\Leftrightarrow\hept{\begin{cases}\left(2x+1\right)^2=3^2\\\left(2x+1\right)^2=-3^2\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}2x+1=3\\2x+1=-3\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}2x=3-1\\2x=\left(-3\right)-1\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}2x=2\\2x=-4\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}x=2:2\\x=\left(-4\right):2\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}x=1\\x=-2\end{cases}}\)
