giúp mình voi
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BH
Giải giúp mình bài 17 voi
1
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
0
NT
5
PT
1
NV
Nguyễn Việt Lâm
Giáo viên
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
a)A:Could you tell me how go to the bookstore?
B:Go straight a head.Take the first street on the right
The bookstore is on your the supermarket
b)C: Could you show me the way to the bank, please?
D: Go straight a head. Take the second street on the left
The bank is next to fashion shop
c)E: Could you tell me how go to the bakery?
F: Go straight a head. Take the third street on the left
Turn the left. Go straight a head. The bakery next to the park
d)G:Could you show me the way to the fashion shop, please?
H: Go straight a head. Take the second street on the left
The fashion shop is oppisite the hotel
e)I: Could you tell me how go to hospital, please?
J: Go straight a head. Take the second street on the right
The hospital is oppisite the toystore
f) Could you show me the way to the bus stop?
Go straight a head. Take the first street on the left
The bus stop is next to the museum
g) Could you tell me how go to the toy store, please?
Go straight a head. Take the second on the right
The hospital is next to the post office
h) Could you show me the way to the restaurant, please?
Go straight a head. Take the first street on the right
The restaurant is next to the supermarket
Nếu sai thì cho mk xl
câu a phải là on the right mới đúng