The formula of surface area, volume and perimeter of cuboid and cube, the formula of volume and surface area of cylinder, the formula of volume of cone (both positive and negative formulas) (all in letters) are in urgent use,

The formula of surface area, volume and perimeter of cuboid and cube, the formula of volume and surface area of cylinder, the formula of volume of cone (both positive and negative formulas) (all in letters) are in urgent use,

The surface area formula of a cube is s = 6A & # 178; the volume formula of a cube is v = A & # 179; or V = sh; the surface area formula of a cuboid is s = 2Ab + 2ah + 2bh; the volume formula of a cuboid is v = ABH or V = sh; the surface area formula of a cylinder is s = π DH + 2 π R & # 178; or S = 2 π RH + 2 π R & # 178; the surface area formula of a cylinder is s = π DH + 2 π R & # 178

The side length of a square is 6.3cm. What are its area and perimeter? (calculated by letter formula)

I know

The side length of a square is 6cm. Calculate its perimeter and area. Use the letter formula

The sides of the two squares are 8 cm and 6 cm respectively. Then the perimeter ratio of the two squares is (): (), and the area is (): ()
Given a: B = 1:2, B: C = 3:4, then a: B: C = (): ()
Rewrite the line segment scale of 0 ··· 30 ··· 60 ··· 90 km to the value scale of ()
For a job, Party A does it in one fourth of an hour alone, and Party B does it in one sixth of an hour. The ratio of time for Party A and Party B to complete the project is (), and the ratio of work efficiency for Party A and Party B is ()
The ratio of 4 / 5:0.25 to the simplest integer is (), and the ratio is ()
A rectangle is equal to a square in circumference. If the width of the rectangle is one fifth of the length, the area ratio of the rectangle to the square is ()

The sides of the two squares are 8 cm and 6 cm respectively, then the perimeter ratio of the two squares is (4): (3), and the area is (1, 6): (9). It is known that a: B = 1:2, B: C = 3:4, then a: B: C = (3): (6): (8). Rewrite the line segment scale 0 ··· 30 ···· 60 ··· 90 km into the value scale

75 - (- 1 / 2) + (- 5 / 6) - (- 3 / 8) + 4 and 1 / 3
75 - (- 1 / 2) + (- 5 / 6) - (- 3 / 8) + 4 and 1 / 3 =?

75 - (- 1 / 2) + (- 5 / 6) - (- 3 / 8) + 4 and 1 / 3
=2 and 3 / 4 + 1 / 2-5 / 6 + 3 / 8 + 4 and 1 / 3
=(2 + 6 / 8 + 4 / 8 + 3 / 8) + (4 + 2 / 6-5 / 6)
=3 and 7 / 8 + 3 and 1 / 2
=7 and 3 / 8

5.75-[(-3/8)+(-0.5)-(-5/6)+4'2/3]-1/8
4'2 / 3 means 4 and 3 / 2
*/*It means * of *

Original formula = 5'3 / 4 - (- 3 / 8-1 / 2 + 5 / 6 + 4'2 / 3) - 1 / 8
=5'6/8+3/8+4/8-(5/6+4'4/6)-1/8
=6'3/6-5'4/6
=5/6
It's made by yourself. It's not borrowed

12 + 1 and 3 / 4-8 and 5 / 12-6.75

12 + 1 + 4 / 3-8 + 12 / 5-6.75
=12+7/3-10.4-6.75
=12-10.4-6.75+7/3
=-5.15+7/3
=-103/20+7/3
=-169/60
=-2 and 49 / 60

75 - [(- 1 / 2) - (- 5 / 6) + (- 3 / 8)] + 4 and 2 / 3 =?

2.75 - [(- 1 / 2) - (- 5 / 6) + (- 3 / 8)] + 4 and 2 / 3
=11 / 4 - [(- 1 / 2) + 5 / 6 - 3 / 8)] + 14 / 3
=11/4-（-1/24）+14/3
=66/24+1/24+112/24
=179/24

2 / 3 of a number is 64. What is 5 / 8 of this number

This number = 64 / (2 / 3) = 96
5 / 8 of this number is 96 * 5 / 8 = 60

40% of a number is 7 more than 3 / 8 of 24. What's the number
5x-80% = 16.2

40%*x-24*(3/8)=7
40%*x=16
x=40