Giúp vs huhu
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4 tháng 8 2021
d) Ta có: \(1,25\cdot\left(-2\right)^2-0.5:\dfrac{5}{12}+15\%\)
\(=\dfrac{5}{4}\cdot4-\dfrac{1}{2}\cdot\dfrac{12}{5}+\dfrac{3}{20}\)
\(=5-\dfrac{6}{5}+\dfrac{3}{20}\)
\(=\dfrac{100}{20}-\dfrac{120}{20}+\dfrac{3}{20}\)
\(=\dfrac{-17}{20}\)
13 tháng 2 2022
More progress in gender equality will be made by the Vietnamese government
Old men should be treated with respect by children
2 câu dưới mình làm rồi nha bạn =))
JJ
16 tháng 4 2022
1.Jackson is from China
2.He listens to music in his free time
3.She is a dancer
4.Yes, she does
5.Tung is from Vietnam
6.He sufts the internet in his free time
JH
16 tháng 4 2022
1. Jackson is from china
2.Jackson listens to music in his free time
3.Lisa is a dancer
4.Yes she does
5.Tung is from Vietnam
6.Tung surfs internet in his free time.
"Chúc em học tốt"
22 tháng 10 2023
a: ĐKXĐ: \(\left\{{}\begin{matrix}x>=0\\x\ne1\end{matrix}\right.\)
\(P=\left(\dfrac{x+2}{x\sqrt{x}-1}+\dfrac{\sqrt{x}}{x+\sqrt{x}+1}+\dfrac{1}{1-\sqrt{x}}\right):\dfrac{\sqrt{x}-1}{2}\)
\(=\left(\dfrac{x+2}{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}+\dfrac{\sqrt{x}}{x+\sqrt{x}+1}-\dfrac{1}{\sqrt{x}-1}\right)\cdot\dfrac{2}{\sqrt{x}-1}\)
\(=\dfrac{x+2+\sqrt{x}\left(\sqrt{x}-1\right)-x-\sqrt{x}-1}{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}\cdot\dfrac{2}{\sqrt{x}-1}\)
\(=\dfrac{1-\sqrt{x}+x-\sqrt{x}}{\left(\sqrt{x}-1\right)^2}\cdot\dfrac{2}{x+\sqrt{x}+1}\)
\(=\dfrac{2}{x+\sqrt{x}+1}\)
b: \(x=7-4\sqrt{3}=\left(2-\sqrt{3}\right)^2\)
Khi \(x=\left(2-\sqrt{3}\right)^2\) thì
\(P=\dfrac{2}{\left(2-\sqrt{3}\right)^2+\sqrt{\left(2-\sqrt{3}\right)^2}+1}\)
\(P=\dfrac{2}{7-4\sqrt{3}+2-\sqrt{3}+1}\)
\(=\dfrac{2}{10-5\sqrt{3}}=\dfrac{4+2\sqrt{3}}{5}\)
c: P>=2/3
=>P-2/3>=0
=>\(\dfrac{2}{x+\sqrt{x}+1}-\dfrac{2}{3}>=0\)
=>\(\dfrac{1}{x+\sqrt{x}+1}-\dfrac{1}{3}>=0\)
=>\(\dfrac{3-x-\sqrt{x}-1}{3\left(x+\sqrt{x}+1\right)}>=0\)
=>\(-x-\sqrt{x}+2>=0\)
=>\(x+\sqrt{x}-2< =0\)
=>\(\left(\sqrt{x}+2\right)\left(\sqrt{x}-1\right)< =0\)
=>\(\sqrt{x}-1< =0\)
=>0<=x<=1
Kết hợp ĐKXĐ, ta được: 0<=x<1
1.football
2.hockey
3.table tennis
4.golf
5.volleyball
6.squash
7.basketball
8.cricket
9.tennis