Diện tích xung quanh phòng học là:

(11 + 4,5) x 2 x 4 = 124(m2)

Diện tích trần nhà là:

11 x 4,5 = 49,5(m2)

Diện tích xung quanh phòng học và diện tích trần nhà là:

124 + 49,5 = 173,5(m2)

Diện tích cần lăn sơn là:

173,5 - 14,5 = 159(m2)

Đáp số: 159 m2

Diện tích xung quanh căn phòng là :
   (11+4,5)x2x4=124(m²)
Diện tích trần nhà là : 
    11x4,5=49,5(m²)
Diện tích cần lăn sơn là :
  124+49,5-14,5=159(m²)
Đáp số : 159 m²

Em sẽ có gắng học thật giỏi để  ko làm uổng phí những sự hi sinh của cha ông chúng ta.

Ok chưa

Bài 3: 

Gọi số học sinh là x

Theo đề, ta có: \(x-5\in BC\left(8;12;15\right)\)

mà 300<=x<=400

nên x=365

\(14000000\)

them kiu bạn rất nhiều! mãi iuu~

a)\(-1,6:\left(1+\dfrac{2}{3}\right)=-1,6:\dfrac{5}{3}=-\dfrac{8}{5}.\dfrac{3}{5}=\dfrac{-24}{25}\)

b)\(\left(\dfrac{-2}{3}\right)+\dfrac{3}{4}-\left(-\dfrac{1}{6}\right)+\left(\dfrac{-2}{5}\right)=-\dfrac{2}{3}+\dfrac{3}{4}+\dfrac{1}{6}-\dfrac{2}{5}=\dfrac{-40+45+10-24}{60}=\dfrac{-9}{60}=\dfrac{-3}{20}\)

c)\(\left(\dfrac{-3}{7}:\dfrac{2}{11}+\dfrac{-4}{7}:\dfrac{2}{11}\right).\dfrac{7}{33}=\left(\dfrac{-3}{7}.\dfrac{11}{2}+\dfrac{-4}{7}.\dfrac{11}{2}\right).\dfrac{7}{33}=\left[\dfrac{11}{2}\left(\dfrac{-3}{7}+\dfrac{-4}{7}\right)\right].\dfrac{7}{33}=\dfrac{-11}{2}.\dfrac{7}{33}=\dfrac{-7}{6}\)

d)\(\dfrac{-5}{8}+\dfrac{4}{9}:\left(\dfrac{-2}{3}\right)-\dfrac{7}{20}.\left(\dfrac{-5}{14}\right)=\dfrac{-5}{8}-\dfrac{4}{9}.\dfrac{3}{2}+\dfrac{1}{8}=\dfrac{-5}{8}+\dfrac{1}{8}-\dfrac{2}{3}=-\dfrac{7}{6}\)

       Christmas is a magical and enchanting time of year. It is a joyous and festive occasion filled with love, happiness, and excitement. The air is filled with a warm and cozy atmosphere, as families come together to celebrate. The beautifully decorated Christmas tree sparkles with twinkling lights and shimmering ornaments. Delicious and indulgent feasts are prepared, filling the air with mouth-watering aromas. Generosity and kindness abound as people exchange thoughtful and heartfelt gifts. The joyful laughter of children fills the air, accompanied by the melodic sounds of Christmas carols. The winter scenery is breathtaking, with glistening snowflakes and frosty landscapes. The spirit of Christmas is truly magical, bringing warmth, joy, and togetherness to all.

    Christmas is a magical and enchanting time of year. It is a joyous and festive occasion filled with love, happiness, and excitement. The air is filled with a warm and cozy atmosphere, as families come together to celebrate. The beautifully decorated Christmas tree sparkles with twinkling lights and shimmering ornaments. Delicious and indulgent feasts are prepared, filling the air with mouth-watering aromas. Generosity and kindness abound as people exchange thoughtful and heartfelt gifts. The joyful laughter of children fills the air, accompanied by the melodic sounds of Christmas carols. The winter scenery is breathtaking, with glistening snowflakes and frosty landscapes. The spirit of Christmas is truly magical, bringing warmth, joy, and togetherness to all.

A

1. A

2. B

3. C

4. D

5. B

6. A

7. C

8. A

9. B

10. C

1. A      2. B       3. C       4. D      5. B       6. A          7. C          8. A        9. B       10. C

ai giúp mình đi xong mình tick cho =(