Painting the perimeter of the auditorium is 24 meters wide and 24 meters high, with a total area of 64 square meters. If the coating cost is 1,2 yuan per square meter, it will cost at least a few yuan

The key is to calculate the total area of the auditorium, the roof plus walls, not the ground. The painting area is 24 * 24 + 24 * 3.5 * 2 + 24 * 3.5 * 2 = 912. Multiply the cost by 1.2. If you paint around the walls in your proposition, you'd better make sure whether you calculate the roof. If you don't calculate the roof, it is 24 * 3.5 * 2 + 24 * 3.5 * 2

An auditorium is 25 meters long, 10 meters wide and 4.5 meters high. Now it is necessary to paint the top and four walls (excluding the door and window area of 68 square meters), If 0.2 kg of paint is used per square meter, how many kg of painting cost is required? 2： An office is 5 meters long and 4 meters wide. Except for 10 square meters of doors and windows, wallpaper should be pasted on other walls and top surfaces. A roll of paper can be pasted for 5 square meters. How many rolls of wallpaper should we buy at least? (keep the number as an integer) 3： A swimming pool is 45 meters wide, 30 meters wide and 2 meters deep. A layer of face bricks is paved on all sides of the swimming pool. How many square meters is the area of face bricks? If the face brick is a square with a side length of 0.5m, how many face bricks do you need? 4： How many square decimeter boards does a carpenter need to make a drawer 5 decimeters long, 3 decimeters wide and 0.08 decimeters high? 5： The processing plant needs to make a batch of cuboid tape recorder sets. The current length is 60cm, the width is 20cm and the height is 15cm. How many square meters of cloth should be used to make 2500 such tape recorder sets? (no underside) There are five questions in total. Don't miss them. If you answer correctly, I'll offer you reward points

（1） [(25 * 10 + 25 * 4.5 + 10 * 4.5) * 2-25 * 10] * 0.2
=[(250+112.5+45)*2-250]*0.2
=(502.5*2-250)*0.2
=150
（2） [(5 * 4 + 5 * 3 * 2 + 4 * 3 * 2) - 10] / 5 = 12.8
Purchase 13 rolls
III 45 * 30 + 45 * 2 * 2 + 30 * 2 * 2 = 1650
45*30/0.25=5400
45*2*2/0.25=720
30*2*2/0.25=480
5400+720+480
IV 5 * 3 + 5 * 0.08 * 2 + 3 * 0.08 * 2 = 16.28
V 60 * 20 + 60 * 15 * 2 + 20 * 15 * 2 = 3600 cm2 = 36 M2
36 * 2500 = 90000 M2

A flat roof classroom is 7 meters long and 6 meters wide. The sum of the door and window area is 20 square meters. How much do you want to paint the top and four walls of the classroom

（7 × 3+3 × 6） × 2+7 × 6-20
＝（21+18） × 2+42-20
＝39 × 2+42-20
＝78+42-20
= 100 (M2)

To paint an auditorium 26 meters long, 12 meters wide and 4.5 meters high, the door and window area is 58 square meters. If the coating fee per square meter is 0.80 yuan, how much does it cost to paint the walls around the auditorium?

Heart de pain,
Area: 2 × （26 × 4.5＋12 × 4.5) - 58 ＝ 284 (M2)
Coating cost: 284 × 0.80 ＝ 227.2 (yuan)

An auditorium is 20 meters long, 15 meters wide and 8 meters high. The ceiling and surrounding walls of the auditorium should be painted. The area of doors and windows is 120 square meters, and the average coating is 0.45 kg per square meter. How many kilograms of coating is required?

Painting area:
twenty × 15+20 × eight × 2+15 × eight × 2-120，
=300+320+240-120，
=860-120，
=740 (M2);
How much paint to use: 0.45 × 740 = 333 (kg);
A: a total of 333kg of paint is required

A trapezoidal land area is 16 square meters, the upper bottom is 4.6 meters, the height is 3.2 meters, and how many meters is the lower bottom?

Set the bottom of the trapezoid as X meters,
（4.6+x） × 3.2÷2=16，
       14.72+3.2x=32，
             3.2x=17.28，
                x=5.4；
A: the bottom is 5.4 meters

Painting the perimeter of the auditorium is 24 meters wide and 24 meters high, with a total area of 64 square meters. If the coating cost is 1,2 yuan per square meter, it will cost at least a few yuan