Now you need to buy 1 cubic meter of wood. For example, 4 meters long, 0.08 meters wide, 0.05 meters high is less than 3 cubic meters For example, 4 meters long, 0.08 meters wide, 0.05 meters high is equal to less cubic? If you have, please teach me more carefully! Teach me how to calculate! Now I need it very much!

4 * 0.08 * 0.05 = 0.016m3, if the square material is length * width * height, the column material is bottom area * height

How many pieces of wood are two meters long, four centimeters wide and two centimeters high

n=1÷（2*0.04*0.02）
=1÷0.0016
=625

What is the unit of length nano used to represent?

Nanometer is one billionth of a meter and one millionth of a millimeter. It is used to represent the length of an atom and a single bacterium. Nanometer is the size of four atoms, smaller than the length of a single bacterium

It is known that the sum of solutions X and y of the system of equations {x + 3Y = 2-5A, X-Y = 2A is negative, and a is the smallest positive integer that meets the condition

X+3Y=2-5a,X-Y=2a
The sum of the two formulas leads to
2(X+Y)=2-3a2/3
A is the smallest positive integer that meets the condition
a=1
aX

Use 0-9 to make three numbers, and the sum is 1000 (each number cannot be repeated)

These three numbers should not contain 8 and 9, because the addition of 0-9 = 45, while the addition of three numbers should be 28, 45-28 = 17, and 8 + 9 = 17. The rest can be arbitrarily combined, so that the sum of individual digits is 10, and the sum of ten and hundred digits is 9
For example: 401 + 32 + 567 = 1000

If the eccentricity of hyperbola x2a2 − y2b2 = 1 (a ＞ 0, B ＞ 0) is e, and the intersection points of the straight line passing through the right focus and the hyperbola with a slope of 2e-2 are in the third and fourth quadrants respectively, then the value range of E is______ ．

The answer is: 1 < e < 53

Compare the following numbers
-11 / 3 and -0.273
-- 2.65 and - (- 2.6)

-11 / 3 and -0.273 multiply 0.273 by 3 to get 0.8190.273 = 0.819/3 & lt; 11 / 3 ℅ - 0.273 & gt; - 11 / 3 - | - 2.65 | - 2.65 | = - 2.65 - (- 2.6) = 2.6 | - 2.65 | - 2.6

It is known that the quadratic equation AX2 + BX + C = 0 has a root of - 1
It is known that the quadratic equation AX2 + BX + C = 0 has a root of - 1, and a = (C-3 under the root) + (3-C under the root) - 2 to find the value of a, B, C

There is a root - 1
So A-B + C = 0
A = radical (C-3) + radical (3-C) - 2
The number of square root is greater than or equal to 0
So C = 3
So a = - 2
Substituting (1) gives B = 1

The rule of rational number subtraction subtracts the opposite number whose number is equal to plus one. Is that 21-3 / 4 equal to 21 + 3 / 4

Exactly

If the quadratic equation kx2 + 3kx + K-3 = 0 has a positive root and a negative root, then the value range of the real number k is______ ．

Let f (x) = kx2 + 3kx + K-3, ∵ univariate quadratic equation kx2 + 3kx + K-3 = 0 have a positive root and a negative root, ∵ K ＞ 0f (0) ＜ 0 (1) or K ＜ 0f (0) ＞ 0 (2), ∵ f (0) = K-3, ∵ 0 ＜ K ＜ 3 can be obtained from 1; X ∈ can be obtained from 2; the value range of real number k is 0 ＜ K ＜ 3