Is logarithm Logan + logam = loga (n * m)?

Is logarithm Logan + logam = loga (n * m)?

yes

Try to explain: logam Logan = logam / n

logaM=x
logaN=y
M=a^x,N=a^y
Left = X-Y
Right = loga (M / N) = loga (a ^ X / A ^ y) = loga (a ^ (X-Y)) = X-Y
Left = right

A natural number with two factors must be prime. Why is it wrong?

Prime number refers to the number in a natural number greater than 1, which can not be divided by other natural numbers except 1 and the integer itself
1 and 0 are neither prime nor composite numbers. Here we consider the particularity of 0, so we are wrong
Note: in the textbooks of the 1970s and 1980s, 0 is not a natural number, but an integer. It seems that 0 was classified as a natural number only after 1993, so in the old textbooks, the answer to this question can be right

If cos (π + a) = - half, then sin (π + a) =?

Cos (π + a) = - 1 / 2, so cosa = 1 / 2, so sin (half π + a) = cosa = 1 / 2

There are two baskets of apples. The first basket is 90% of the second basket. If the second basket gives the first basket 10 kg, the two baskets will be the same. How many kg are the two baskets?

360 kg
Let a basket be 9x and B basket be 10x
The formula is: 9x + 10 = 10x-10
X = 20 kg
Basket a 9x = 180kg. Basket B 10x = 200kg
180 + 200 = 380 kg

1 1 / 2 2 / 3 5 / 8 3 / 5, and so on, what is the 100th number,

(n + 1) / 2n 100 brings in 101 / 200

Does integer include 0? The definition of natural number,
I've lost my head recently

Integers include 0. When we count objects, 0,1,2,3, which represent the number of objects, are called natural numbers. Natural numbers, 0 and negative integers are all integers

What's 36 minutes and 48 seconds for a math problem

1′=60″
36′+48″=36′+0.8′
=36.8′

The sum of four consecutive natural numbers is a three digit number between 400 and 440, and the sum can be divisible by 9. It is necessary to find the four consecutive natural numbers______ 、______ 、______ 、______ ．

According to the above analysis, only 414 numbers can be divided by 9 between 400 and 440. Let the minimum natural number be X. according to the meaning of the question, we get x + X + 1 + X + 2 + X + 3 = 414, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 4x + 6 = 414, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 4x = 414-6, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 408 △ 4, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 102, x + 1 = 102 + 1 = 103, x + 2 = 102 + 2 = 104, x + 3 = 102 + 3 = 105. A: these four continuous natural numbers are 102103104105. So the answer is: 102103104105

How to find multiple square root of hp12c calculator

All scientific calculators use the x ^ y key to find the root of multiple squares
For example, to find the 17th root of 35 is to find 35 ^ (1 / 17)
3→5→x^y→(→1→/→7→)→=→1.2326.
If the calculator has no Bracket key, first calculate 1 / 17 = 0.05882
35→x^y→0.05882→=→1.2326