The sum of the volume of a cone and a cylinder with the same base and height is 25.12 cubic decimeters, and the volume of a cone is fast

The sum of the volume of a cone and a cylinder with the same base and height is 25.12 cubic decimeters, and the volume of a cone is fast

It's volume divided by 4, which is 6.28, because the volume of a cone is one-third of the volume of a cylinder with the same base and height

Who is going to fill in the problem of operational symbols in primary school?
61386138=1111
61386138=6666
61386138=3333
Add appropriate operation symbols to the number on the left side of the equal sign, and make it into 111166663333. Who will have a try?

There are 25 solutions: 6 + (1 + 38) * (61 / 3 + 8) = 1111, 6 + 13 * (8 * 6-1 + 38) = 1111 ((6-1) * 3 + 86) * (1 * 3 + 8) = 1111, ((6-1) * 3 + 86) * 1 * (3 + 8) = 1111 ((6-1) * 3 + 86 * 1) * (3 + 8) = 1111, ((6-1) * 3 + 86) / 1 * (3 + 8) = 1111

F (x) = ln (25 sin2x)
How to derive trigonometric function SiNx cosx TaNx and so on

If f (x) '= 2cos2x / 25sin2xsinx' = cosxcosx '= - sinxtanx = SiNx / cosx, the derivation is: TaNx' = (SiNx '* cosx SiNx * cosx') / (cosx) ^ 2 = 1 / (cosx) ^ 2 = (SiNx '* cosx SiNx * cosx') / (cosx) ^ 2 = 1 / (cosx) ^ 2

If the mass of the solid ball is 390g and the density of iron is 7.8 * 10kg / m3, its volume is______ Cubic centimeter

390/7.8=50

3388 is 24

8/(3-8/3)

Find the detailed rules of function translation
General trigonometry refers to logarithmic function translation, especially trigonometry

Image transformation of trigonometric functions 1. Transformation from sinusoidal curve to sinusoidal curve

A piece of wood is 20 decimeters long, which is divided into four equal cylinders, and the surface area is increased by 18.84 square decimeters?

Bottom area = 18.84 △ 6 = 3.14 square decimeters
Radius = 1 decimeter
Surface area = 2 bottom area + side area = 2 × 3.14 + 2 × 3.14 × 1 × 20 = 131.88 square decimeters

It's 24:4, 5 minus 2, minus 3

4×[5+(-2)-(-3)]=24
[(-3)-5-4]×(-2)=24

How to use the concept of derivative to calculate the instantaneous velocity of an object

It should be (2n-1) 2 + {[(2n-1) 2-1] / 2} 2 = {[(2n-1) 2 + 1] / 2} 2
prove
{[(2n-1)2+1]/2}2-{[(2n-1)2-1]/2}2
Square difference
={[(2n-1)2+1]/2+[(2n-1)2-1]/2}{[(2n-1)2+1]/2-[(2n-1)2-1]/2}
=(2n-1)2×1
=(2n-1)2
So (2n-1) 2 + {[(2n-1) 2-1] / 2} 2 = {[(2n-1) 2 + 1] / 2} 2

How many square meters is 700 0.6 inches?
How many square meters are 700 0.6 square inches?

1 inch = 2.54 cm
1 square inch = 2.54 * 2.54 = 6.4516 square centimeter
700 * 0.6 = 420 square inches = 2709.67 square centimeters
=2709 square meters