Divide the 5-meter-long rope into 4 sections, and each section is the length of the rope___ Each paragraph is___ Rice

Divide the 5-meter-long rope into 4 sections, and each section is the length of the rope___ Each paragraph is___ Rice

Each section of the rope is: 1 △ 4 = 14, each section is: 5 × 14 = 54 (m)

A 3.5m long timber is sawn into two sections on average, and the surface area increases by 4.4 square decimeters. What is the volume of this timber?

4.4/2×3.5=7.7

Saw a 9-meter-long cuboid wood into two sections, and the surface area increased by 800 square decimeters. How many cubic meters is the volume of this wood?

After sawing into two sections, the surface area is increased by two sections, that is, 800 square decimeters more than the original, so the area of one section is 800 / 2 = 400 square decimeters
The volume of this wood is 400 / 100 * 9 = 36 cubic meters