1, cuboid surface area = (length× width+width× height+length× height )× 2 volume = length× width× height (or volume = bottom area× height)

2. The surface area of the cube = side length × side length× 6 volume = side length× side length× side length (or volume = bottom area× height.

The volume calculation method is the same as the volume calculation method, except that the volume is measured from the outside and the volume is measured from the inside of the container. Common unit of volume are: liter and milliliter. 1 l = 1 cubic decimeter, 1 ml = 1 cubic centimeter.

3. The calculation method of the score is: add and subtract with the denominator, the denominator is unchanged, and the numerator is added and subtracted.

Fractions with different denominators are calculated by dividing the fraction by the fraction with the same denominator, and then adding and subtracting the fraction with the same denominator.

(What can be simplified as a result should be simplified)