Three math problems. Urgent 1. The 4-meter-long rope is cut into 9 sections on average. How many meters are the two sections taken out? 2. A △ B = 18, then what is the least common multiple of a and B? 3. There is a cuboid ice storage container which is 80cm long, 60cm wide and 115cm high. It is filled with cubes of the same size. How many cubes of ice can this container hold at least?

Three math problems. Urgent 1. The 4-meter-long rope is cut into 9 sections on average. How many meters are the two sections taken out? 2. A △ B = 18, then what is the least common multiple of a and B? 3. There is a cuboid ice storage container which is 80cm long, 60cm wide and 115cm high. It is filled with cubes of the same size. How many cubes of ice can this container hold at least?

2 of 1.9 sections, i.e. 2 / 9, 2 / 9, 4 × 2 / 9, 8 / 9m
2. If a is an integral multiple of B, the least common multiple of both is a itself
3. It doesn't say to be full or the size of cube ice. It can be said that at least 0 ice cubes can be filled
The conditions are inadequate
If the cube must be filled, then the length of the edges of the cube must be the greatest common divisor of 80, 60 and 115, which can only be 5. The length is 16 5, the width is 12 5, and the height is 23 5. The final result is 16 × 12 × 234416

A rectangular glass fiber reinforced plastic, the bottom of 6 decimeters long, 4 decimeters wide, a bottom area of 4 square decimeters rectangular steel completely immersed in water, when the water surface rises 5 cm, how long is this steel?

Idea: first of all, we need to understand the rate of progress between units: 1 decimeter = 10 cm, 1 decimeter square = 100 cm square. Volume = bottom area x height. Area = length x width. The bottom of the rectangular glass fiber reinforced plastic is 6 decimeters long, that is 60 cm, and 4 decimeters wide, that is 40 cm. So the bottom product of the rectangular glass fiber reinforced plastic is 2400 bisection cm, and the water surface rises 5 cm, That is to say, the volume of the steel just now is 2400x5 = 12000 cubic centimeters. It is known that the bottom area of the steel is 4 bisection decimeters, that is 400 bisection centimeters, so the length of the steel is 12000 cubic centimeters divided by 400 square centimeters, which is equal to 30 centimeters
6 (decimeter) = 60 (CM), 4 (decimeter) = 40 (CM),
40x60 = 2400 (cm2), 2400x5 = 12000 (cm3)
4 (square decimeter) = 400 (square centimeter) 12000 / 400 = 30 (centimeter)
So this piece of steel is 30 cm long

A batch of parts at 8:00 a.m. and B at 6:00 a.m. how many parts can they complete in one hour

Can complete all 1 / 8 + 1 / 6 = 7 / 24
All 1-7 / 24 left = 17 / 24