My dream house is hi-tech house by the sea with many sands and water surroundings. There will have 12 large rooms and it will have many green trees, flowers and have big swimming pool in the garden. In each rooms, it will have a super smart TV, a super smart car, high-tech robot: the super smart TV will help me surf the Internet, send and receive my email, order food from the supermarket and contact my friends on other planets. High-tech robot will clean the floors, cook the meals, wash the clothes, water the flowers and feed the dogs and cats.I love my dream house very much.I hope that one day my dream will come true.

My dream home is a luxurious looking house. In the garden there are lots of flowers, colorful. Of course there must be shade trees around the garden. After the garden there is also a large swimming pool. Western interior design. The office is also a bit wide. Constructing enough room for families and each room designed according to each person's preferences. That is the house I dreamed of.

*Ryeo*

?????? câu hỏi bị tàng hình sao

Where is the question ?

\(\left(2x+\frac{3}{5}\right)^2-\frac{9}{25}=0\)

\(\Leftrightarrow\left(2x+\frac{3}{5}\right)^2=\frac{9}{25}\)

\(\Leftrightarrow\orbr{\begin{cases}2x+\frac{3}{5}=\frac{3}{5}\\2x+\frac{3}{5}=\frac{-3}{5}\end{cases}\Leftrightarrow\orbr{\begin{cases}2x=0\\2x=\frac{-6}{5}\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=0\\x=-\frac{12}{5}\end{cases}}}\)

Vậy \(x=\left\{0;\frac{-12}{5}\right\}\)

Gọi số bi ban đầu trong hộp là x (viên) (x>0)

Theo bài ra: \(x-\frac{2}{3}x+30=\frac{5}{6}x\)

<=> \(\frac{1}{2}x=30\)

<=> \(x=60\)

Vậy lúc đầu trong hộp có 60 viên bi

\(\frac{1}{7}\cdot\frac{2}{9}+\frac{1}{9}\cdot\frac{3}{7}+\frac{1}{7}\cdot\frac{4}{9}\)

\(=\frac{2}{7}\cdot\frac{1}{9}+\frac{1}{9}\cdot\frac{3}{7}+\frac{4}{7}\cdot\frac{1}{9}\)

\(=\frac{1}{9}\left(\frac{2}{7}+\frac{3}{7}+\frac{4}{7}\right)\)

\(=\frac{1}{9}\cdot\frac{9}{7}=\frac{1}{7}\)

\(\frac{1}{7}.\frac{2}{9}+\frac{1}{9}.\frac{3}{7}+\frac{1}{7}.\frac{4}{9}\)

\(=\frac{2}{7}.\frac{1}{9}+\frac{1}{9}.\frac{3}{7}+\frac{4}{7}.\frac{1}{9}\)

\(=\frac{1}{9}.\left(\frac{2}{7}+\frac{3}{7}+\frac{4}{7}\right)\)

\(=\frac{1}{9}.\frac{9}{7}\)

\(=\frac{1}{7}\)

And can you challenge yourself?

LINK:https://olm.vn/hoi-dap/detail/257197188334.html