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Những câu hỏi liên quan
BH
Giải giúp mình bài 17 voi
1
NL
Nguyễn Lê Phước Thịnh
CTVHS
4 tháng 7 2021
Bài 17:
a) Ta có: \(M=\left(\dfrac{\sqrt{x}+2}{x+2\sqrt{x}+1}-\dfrac{\sqrt{x}-2}{x-1}\right):\dfrac{\sqrt{x}}{\sqrt{x}-1}\)
\(=\dfrac{\left(\sqrt{x}+2\right)\left(\sqrt{x}-1\right)-\left(\sqrt{x}-2\right)\left(\sqrt{x}+1\right)}{\left(\sqrt{x}+1\right)^2\cdot\left(\sqrt{x}-1\right)}:\dfrac{\sqrt{x}}{\sqrt{x}-1}\)
\(=\dfrac{x-\sqrt{x}+2\sqrt{x}-2-x-\sqrt{x}+2\sqrt{x}+2}{\left(\sqrt{x}+1\right)^2\cdot\left(\sqrt{x}-1\right)}\cdot\dfrac{\sqrt{x}-1}{\sqrt{x}}\)
\(=\dfrac{2\sqrt{x}}{\sqrt{x}\left(\sqrt{x}+1\right)^2}\)
\(=\dfrac{2}{\left(\sqrt{x}+1\right)^2}\)
24 tháng 2 2022
bạn đăng tách ra cho mn cùng giúp nhé
Bài 2 :
a, bạn tự vẽ
b, \(\left\{{}\begin{matrix}x^2-x-2=0\\y=x^2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=-1;x=2\\y=1;y=4\end{matrix}\right.\)
Vậy (d) cắt (P) tại A(-1;1) ; B(2;4)
NT
0
NN
1
NL
Nguyễn Lê Phước Thịnh
CTVHS
17 tháng 1
Diện tích xung quanh của căn phòng là:
\(\left(9+6\right)\times2\times4=8\times15=120\left(m^2\right)\)
Diện tích trần nhà là \(9\times6=54\left(m^2\right)\)
Diện tích cần sơn là:
\(120+54-10,5=174-10,5=163,5\left(m^2\right)\)
NT
5
PT
1
11 tháng 5 2021
\(tan^2a+cota=tan^2a+\dfrac{1}{tana}=\left(\dfrac{1}{4}\right)^2+\dfrac{1}{\dfrac{1}{4}}=\dfrac{1}{16}+4=\dfrac{65}{16}\)
NQ
14
1. give / things / him / many / the foreman / this morning / to do / How / did ?
How many things did the foreman give him this morning?
2. having / of / the moment / Tran Phu School / check-up / The students / at / medical / are / a /
The students of Tran Phu School are having a check-up medical at teh moment.
3. yesterday / go / a / had / Lan / school / headache / didn't / because / to / she /.
Lan didn't go to yesterday because she had a headache.
4. catch / milions / cold / Every / people / the / of / year / common.
Every year millions of people catch the common cold.
5. last / days / disappears / cold / for / common / few / then / The / a / and /.
The common cold last for a few days and then disappears.
6. prevent / and / well / a cold / You / doing / eating / can / exercise / help / by /.
You can help prevent a cold by eating well and doing exercise.
7. terrible / the dentist / had / visited / a / toothache / she / because / Trang / yesterday/.
Trang visited the dentise yesterday because she had a terrible toothache.
8. breathing / the facemask / from / Wearing / helps me / in / stop / dust /.
Wearing the facemask helps me stop from breathing in dust.
9. absence / ago / my / a / days / father / note / My / two / sick / wrote / for /.
My father wrote a sick note for my absence two days ago.
10. unpleasant / knows / very / Catching / a cure / but / the common cold / no one / is /.
Catching the common cold is very unpleasant buy no one knows a cure.
Chúc bạn học tốt ^^