lg20=lg2

lg20=lg2

lg20=lg2+1

How to calculate the third grade mathematics

For example, 42 is rounded to 40, while 45 is rounded to 50. For example, 32 × 56 ≈ 1800, do you understand?

How much does 745 equal to in the second grade of primary school?

About ten or 100
It's close to ten
It's close to 700

Is "at least" in mathematics approximately equal to

No, at least this is the smallest possible number. For example, if I have at least five apples, then I may have five or more
For example, China's population is about 1.3 billion, which means about 1.3 billion

Mathematics is about zero basis. How can I learn mathematics?

From junior high school review materials to senior high school, learn all the knowledge points (combined with the teacher's key points), look at the typical topic, memorize the key topic process, it's better to do induction by yourself. If you're lazy, memorize the required knowledge points, and memorize one aspect of knowledge
Remember trigonometric function!

How much is 530 * 8 in the fourth grade of primary school

530×8
≈530×10
=5300

Decimal! Why ten minus one equals one! How to calculate

If it's decimal, it's wrong

0 is not reciprocal, why? My answer is: 0 times any number is equal to 0, but the teacher said: 0 times any number is not equal to 1

Because a number has to be inherited from him, and the number is 1, it is called reciprocal. It is correct to say that any number is not equal to 1. The key to reciprocal is 1. That's why your teacher said so

A mathematical problem: ABCD four unequal numbers, their product a times b times c times d equals 4, then a + B + C + D =?

0.5,0.25,8,4
0.5*0.25*8*4=4
As long as the first three numbers can be eliminated
There are other forms of infinite solutions

What is the product of the reciprocal of 8 out of 11 and 8 out of 13? What times 13 out of 4 = 8 times what = B times what = 1 (B is not equal to 0)
A (a is greater than 0) is compared with his reciprocal ()
A: B: A is equal to his reciprocal; C: A is greater; D: we can't determine the size

What is the product of the reciprocal of 1.8/11 and 8 / 13?
11/8×8/13=11/13
2. What times 13 / 4 = 8 times several = B times several = 1 (B is not equal to 0)
4 / 13 × 13 / 4 = 8 × 1 / 8 = B × 1 / b = 1 (B is not equal to 0)
3. A (a is greater than 0) compared with his reciprocal (d)
A: B: A is equal to his reciprocal; C: A is greater; D: we can't determine the size
When a > 1, a > 1 / A
When 1 > a > 0, 1 / a > a