Số tuổi của Hà năm nay là: 

\(20-8=12\) ( tuổi )

Đ/s:....

\(2\times x-15=22+9\)

\(=>2\times x-15=31\)

\(=>2\times x=31+15\)

\(=>2\times x=46\)

\(=>x=46:2\)

\(=>x=23\)

I went to the shop but I didn't have any money.

1. Table / the right / the wardrobe.

→ The table is on the right of the wardrobe.

2. There / some pictures / the wall.

→ There are some pictures on the wall.

3. There / a window / the left - side / the room.

→ There are some pictures on the left - side of the room.

4. Bed / opposite / the door.

→ The bed is opposite the door.

5. There / some bottles / the shelf.

→ There are some bottles on the shelf.

Chúc bạn học tốt

\(1-\dfrac{1}{3}=\dfrac{3}{3}-\dfrac{1}{3}=\dfrac{2}{3}\)

\(8=2^3\)

\(10=2\times5\)

\(20=2^2\times5\)

BCNN ( 8;10; 20 ) = \(2^3\times5=40\)

nhầm

\(8=2^3\)

\(10=2\times5\)

\(20=2^2\times5\)

\(\RightarrowƯCLN\left(8;10;20\right)=2\)

\(4562+234\times9\)

\(=4562+2106\)

\(=6668\)

__________________________

\(45235:5+4587\)

\(=9047+4587\)

\(=13634\)

__________________________

\(\left(4587-587\right)\times45\)

\(=4000\times45\)

\(=180000\)

__________________________

\(789\times6-987\)

\(=4734-987\)

\(=3747\)

\(\dfrac{1}{4}+\dfrac{3}{4}\times x=\dfrac{2}{3}\)

       \(\dfrac{3}{4}\times x=\dfrac{2}{3}-\dfrac{1}{4}\)

       \(\dfrac{3}{4}\times x=\dfrac{5}{12}\)

              \(x=\dfrac{5}{12}:\dfrac{3}{4}\)

              \(x=\dfrac{5}{12}\times\dfrac{4}{3}\)

       \(x=\dfrac{5}{9}\)