My hobby is(1)colecting books. I collect books whenever I have money and I need some books. I collect many kinds of books such as(2)plants books ; story books or(3)animal books. I am learning at shool, you know, English, maths, history,geography, buology; and books about(4)speaking countries.

I buy books because I would like to(7)get information and facts. They help me broaden(8)knowledge and understanding

In the future, I try to make my collection(9)larger I would like to open(10)the library of my town

\(4.\left(\dfrac{5}{4}\right)^2+25.\left[\left(\dfrac{2}{3}\right)^2:\left(\dfrac{5}{4}\right)^3\right]:\left(\dfrac{3}{5}\right)^3\)

\(=4.\dfrac{25}{16}+25.\left(\dfrac{4}{9}:1\dfrac{61}{64}\right):\dfrac{27}{125}\)

\(=\dfrac{25}{4}+25.\dfrac{256}{1125}:\dfrac{27}{125}\)

\(=\dfrac{25}{4}+\dfrac{256}{45}:\dfrac{27}{125}\)

\(=\dfrac{25}{4}+\dfrac{6400}{243}\)

\(=32\dfrac{571}{972}=\dfrac{31675}{972}\)

2 nick khác nhau chỉ là 1 bạn đó cày thui

Đổi \(2dam^260m^2=260m^2\)

S làm nhà là: \(\dfrac{2}{5}.260=104\left(m^2\right)\)

S trồng hoa là: \(\dfrac{1}{3}.\left(260-104\right)=52\left(m^2\right)\)

S làm chuồng trại và chăn nuôi là:

\(260-\left(104+52\right)=104\left(m^2\right)\)

Vậy......

So sánh \(5^{37}.....11^{24}\)

\(5^{37}=5^{36}.5=\left(5^3\right)^{12}.5=125^{12}.5\)

\(11^{24}=\left(11^2\right)^{12}=121^{12}\)

\(\Rightarrow125^{12}.5>121^{12}\)

Vậy \(125^{12}.5>121^{12}\) hay \(5^{37}>11^{24}\)

\(\left|x-\dfrac{1}{2}\right|+\left|x+y\right|=0\)

\(\Rightarrow\left\{{}\begin{matrix}\left|x-\dfrac{1}{2}\right|=0\\\left|x+y\right|=0\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}x-\dfrac{1}{2}=0\\x+y=0\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0+\dfrac{1}{2}=\dfrac{1}{2}\\\dfrac{1}{2}+y=0\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}x=\dfrac{1}{2}\\y=0-\dfrac{1}{2}=-\dfrac{1}{2}\end{matrix}\right.\)

Vậy \(x=\dfrac{1}{2};y=-\dfrac{1}{2}\)

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