$$\left(a\ +\ b\right)\ \times\ h$$  

$$\frac{a\ +\ b\ \ \times\ h}{2}$$  

$$\frac{\left(a\ +\ b\ \right)\ \times\ h}{2}$$  

$$\left(a\ +\ b\right)\ \times h\ \times2$$  

học vẽ

học nhạc

chơi thể thao

$$46,8\ cm^2$$  

$$48,6\ cm^2$$  

$$16,2\ cm^2$$  

$$23,4\ cm^2$$  

$$68,4\ cm^2$$  

$$64,8\ cm^2$$  

$$55,8\ cm^2$$  

$$65,8\ cm^2$$  

$$150\ cm^2$$  

$$120\ cm^2$$  

$$100\ cm^2$$  

$$152\ cm^2$$  

đúng

sai

$$33,75\ m^3$$  

$$3375\ m^3$$  

$$337,5\ m^3$$  

$$3,375\ m^3$$