A cube pool, edge length of 3.5 meters, this pool covers an area of () square meters, full of water can hold () liters of water. The sum of edge length of a cuboid is 96 cm If the sum of the edge lengths of a cuboid is 96cm and the ratio of length, width and height is 1:2:3, the surface area of the cuboid is () square centimeter and the volume is () cubic centimeter

A cube pool, edge length of 3.5 meters, this pool covers an area of () square meters, full of water can hold () liters of water. The sum of edge length of a cuboid is 96 cm If the sum of the edge lengths of a cuboid is 96cm and the ratio of length, width and height is 1:2:3, the surface area of the cuboid is () square centimeter and the volume is () cubic centimeter

A cube pool, edge length 3.5 meters, this pool covers an area of (12.25) square meters, full of water can hold (42875) liters of water
If the sum of the edges of a cuboid is 96cm and the ratio of length, width and height is 1:2:3, the cuboid has a surface area of (352) square cm and a volume of (384) cubic cm

There is a cube iron block with an edge length of 80 cm. Now we need to melt it into a cuboid with a cross-sectional area of 20 square cm

80 * 80 * 80 = 512000 (cm3)
512000-20 = 25600 (CM)
25600cm=256m

There is a cube iron block with an edge length of 80 cm, which is melted and cast into a cuboid with a cross-sectional area of 20 square cm. How high is the cuboid?
Write the formula

1. The volume of cube is 80 × 80 × 80 = 512000 cubic centimeter
2. The height of the cuboid is 512000 △ 20 = 25600 cm

When we calculate (2 + 1) (2 ^ 2 + 1) (2 ^ 4 + 1) (2 ^ 8 + 1) (2 ^ 16 + 1) (2 ^ 32 + 1), we find that the direct operation is very troublesome. If we multiply (2-1) before the formula, that is, 1, the value of the original formula remains unchanged, and the whole calculation can be calculated by the multiplication formula. The solution process is as follows: the original formula = (2-1) (2 + 1) (2 ^ 2 + 1) (2 ^ 4 + 10 (2 ^ 8 + 1) (2 ^ 16 + 1) (2 ^ 32 + 1)
=(2^2-1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)(2^32+1)
=(2^4-1)(2^4+1)(2^8+1)(2^16+1)(2^32+1)
=.=2^64-1
You can calculate (3 + 1) (3 ^ 2 + 1) (3 ^ 4 + 1) (3 ^ 8 + 1) (3 ^ 16 + 1) with the above method

(3+1)(3^2+1)(3^4+1)(3^8+1)(3^16+1)=(3-1)(3+1)(3^2+1)(3^4+1)(3^8+1)(3^16+1)/(3-1)=(3^2-1)(3^2+1)(3^4+1)(3^8+1)(3^16+1)/2=(3^4-1)(3^4+1)(3^8+1)(3^16+1)/2=(3^8-1)(3^8+1)(3^16+1)/2=(3^16-1)(3^16+1)/2=(3^3...

How to calculate 9.9 + 9.98 + 9.997 + 9.9996 simply

9.9+9.98+9.997+9.9996
＝10-0.1+10-0.02+10-0.03+10-0.0004
＝40-0.1234
＝39.8766

Simple operation: 0.9 + 0.98 + 0.997 + 0.9996 + 0.99995

0.9+0.98+0.997+0.9996+0.99995
=1-0.1+1-0.02+1-0.003+1-0.0004+1-0.00005
=5-0.12345
=4.87655

9 + 98 + 997 + 9996 + 99995 is calculated by the second equation

(10+100+1000+10000+100000)-(1+2+3+4+5)
=111110-15
=111995

Simple operation of 9 + 98 + 997 + 9996 + 99995 + 99994 + 21
Simple operation with primitive number!

9=10-1
98=100-2
9996=10000-4
99995=10000-5
999994=1000000-6
therefore
9+98+997+9996+99995+999994+21
=1111110

Simple operation: 0.9 + 0.98 + 0.997 + 0.9996 + 0.99995 + 0.99994

0.9+0.98+0.997+0.9996+0.99995+0.999994 =(1-0.1)+(1-0.01)+(1-0.001)+…… =6-（0.1+0.01+0.001+……） =6-0.111111 =5.888889

1 / 20 + 1 / 30 + 1 / 42 + 1 / 56 + 1 / 72 + 1 / 90
Better write why. Thank you

=1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+1/9*10
=1/4-1/5+1/5-1/6+...+1/9-1/10
=1/4-1/10
=3/20
This is an Egyptian score, like
1/6=1/2*3=1/2-1/3
The numerator of a fraction is one, and the denominator can be transformed into the number multiplied by two adjacent natural numbers
It can become another form