How to do the second and third application questions on page 39 of the fifth grade math exercise book in Jiangxi primary school? urgent - Training Enrollment Network

How to do the second and third application questions on page 39 of the fifth grade math exercise book in Jiangxi primary school? urgent

1, first find the bottom area of the cuboid: (220- 170)÷2=25 (square centimeter);

2. Find out the length and width of the cuboid: 25m2, 5cm;

3. Then calculate the area of one side: (170-50)÷4=30 (square centimeter); It is known that the height of a cuboid is 30÷5=6 (cm);

4. The volume of the original cuboid: 5*5*6= 150 (cubic centimeter).

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