It is known that the short side of a right triangle is 15. The angle of the short side is 30 degrees?

In a right triangle, the shortest side is the right side because of the difference between the two sides
Because, in a right triangle, the right side of 30 degrees is half of the hypotenuse
So, bevel = 15 * 2 = 30

Given that the lengths of two sides of a right triangle are 7 and 24 respectively, the length of the third side is---

The third side may be hypotenuse: that is, √ (24 & sup2; + 7 & sup2;) = 25
The third side may be a right angle side: that is, √ (24 & sup2; - 7 & sup2;) = √ 527

The general term formula of 0,1,0,1

(1+(-1)^n)/2

The volume of the earth is about 1.1 × 10 cube km, and the volume of the moon is about 2.2 × 10 cube km,
How many times the volume of the earth is that of the moon?

(1.1 × 10 to the 12th power) / (2.2 × 10 to the 10th power)
= (1.1 △ 2.2) × [12-10 power of 10]
＝0.5×10²
= 50 times
The earth is 50 times the size of the moon

The answer to the 14th question of mathematical practical problems and unitary linear equation

4012

Two groups of numbers are listed below, and the nth number is expressed by algebraic formula respectively
⑴1、5、9、13、17、21、……
⑵1、3/4、5/9、7/16、9/25……

(1) If the tolerance is 4, then an = 1 + (n-1) * 4 = 4n-3
(2) It is found that an = [1 + 2 (n-1)] / N ^ 2 = (2n-1) / N ^ 2

What is the sum of all integers whose absolute value is greater than 1 but less than 5?

The sum of all integers with absolute values greater than 1 and less than 5 is 0

There were 280 employees in a factory the year before last, and 40 employees were reduced last year. The profit of the whole factory increased by 1 million yuan, and the profit per capita was at least 6000 yuan. Then the profit of the whole factory in the year before last was at least 100 million yuan______ ．

Suppose that the profit of the whole plant in the previous year is x 10000 yuan, from the meaning of the question, 100 + x280 − 40 ≥ 0.6, the solution is x ≥ 44, so the profit of the whole plant in the previous year is at least 440000 yuan

What are the three primary colors? What color is red plus yellow? What color is red plus green?

Art - red, yellow and blue
Human body - red, green and blue
Red + yellow = orange
Red + Green = Brown, ochre

It is known that the short side of a right triangle is 15. The angle of the short side is 30 degrees?