Three math blanks 1、 The road repair team has repaired 85% of a highway, and there are still ()% not repaired; If there are still 30 kilometers left, the road will be () kilometers long 2、 A pail of pure milk is 20 liters. After drinking 5 liters, fill it with water. This is the concentration of this pail of milk, which is ()% 3、 3 divide by () = 18 = (): 16 = ()% = 75% It's urgent. You can answer any question you can, and you can answer all the last three questions

Three math blanks 1、 The road repair team has repaired 85% of a highway, and there are still ()% not repaired; If there are still 30 kilometers left, the road will be () kilometers long 2、 A pail of pure milk is 20 liters. After drinking 5 liters, fill it with water. This is the concentration of this pail of milk, which is ()% 3、 3 divide by () = 18 = (): 16 = ()% = 75% It's urgent. You can answer any question you can, and you can answer all the last three questions

1、 The road repair team has repaired 85% of a highway, and the remaining (15)% have not been repaired; If there are 30 kilometers left to be repaired, the road is (200) kilometers long
2、 A barrel of pure milk is 20 liters. Drink 5 liters and fill it with water. The concentration of this barrel of milk is (75)%
3、 3 divided by (4) = 18 / 24 = (12): 16 = (75)% = 75%

Fill in the blanks in math. Just three questions 【1】 80% is written as fraction [], decimal [], and percentage []: [] 【2】 100g is []% less than 125g, and 125g is []% more than 100g 【3】 A ÷ B = 2 / 5, then a is []% of B and B is []% of A

【1】 80% is written as fraction [4 / 5], decimal [0.8], and percentage [4]: [5]
【2】 100g is [20]% less than 125g, and 125g is [25]% more than 100g
（125-100）÷125=20%
（125-100）÷100=25%
【3】 A ÷ B = 2 / 5, then a is [40]% of B and B is [250]% of A
2÷5=40%
5÷2=250%

Find the rule and fill it in (1) 4 / 5, (), (), () （2）1,4,9,（）,（）,（）,（）.

(1) 4 / 5, 2 / 5, 1 / 5, (1 / 10), 1 / 20, (1 / 40), (1 / 80)
（2）1,4,9,（16）,（25）,（36）,（49）.

Log is based on 2. What is the square of the logarithm of 8 - 16,

Do you want to input formulas in excel? Or do you want to write out the calculation formula?
Also, your question is a little misleading
Is the square of (log based on 2, logarithm of 8 - 16)?
Or (log is the logarithm of 8 based on 2) - (16) squared?
If it is in Excel, then:
(1) = (log (8,2) - 16) ^ 2 the result is 169
(2) = log (8,2) - 16 ^ 2, the result is - 253
If you are doing your homework and writing a formula, then: (note that the base 2 should use subscript)
(1) = (log2 8 - 16) ^ 2 the result is 169
(2) = log2 8 - 16 ^ 2 results in - 253

Prove the logarithm of log with base n of 2 It is known that n belongs to Z, log is based on 2, and the logarithm of n is a rational number Prove that the logarithm of log with base n of 2 is an integer I hope you can be more detailed

Obviously, logarithms are defined only for positive integers. N = 1, obviously
For positive integers n > 1, there are odd numbers m and nonnegative integers k such that n = M × 2 ^ k, if log2 (n) is a rational number, n > 1, then it must be a positive rational number P / Q, that is, log2 (n) = P / Q, P and Q are positive integers
So, 2 ^ (P / Q) = M × 2 ^ k, so 2 ^ P = m ^ Q × The left side of 2 ^ (KQ) does not contain an odd factor greater than 1. If M is an odd number greater than 1, it is impossible, so m = 1, so p = KQ, so p / Q is an integer K. The proof is completed

Log (a ^ n) M = 1 / n × How can log (a) m prove it? Can we only prove it with the bottom exchange formula?

Bottom change formula:
log(a^n)M=loga(M)/loga(a^n)=loga(M)/n=1/n*loga(M).