Standard definition question no 1. Xiao Wang runs an online store and specializes in clothes of a certain brand. Due to the impact of recent inflation, the clothing of this brand has been reduced twice on the basis of the original price of 1200 yuan, and the percentage of each reduction is x, so the current price of the commodity is____________ Element (the result is expressed by the formula containing x) 2. If the solutions of equation 6x + 3 = 0 and 5x + k = 20 with respect to X are reciprocal to each other, then the value of K is ______ 3. Define new operations @ for positive rational numbers a and B as follows: a@b = [(ab+b ²)/ (a-b)], then 2@3 =____________ . 4. Calculate 12 ° 17 ' × The result of 4 - 23 ° 24 ′ 36 ″ is ____ 5. If (3 + a) ²+ | B-2 | = 0, then the value of 3a-2b-2012 is ____ 6. If it is known that the complement angle of an angle is 10 ° more than 3 times of its remainder angle, then this angle is equal to ___________

Standard definition question no 1. Xiao Wang runs an online store and specializes in clothes of a certain brand. Due to the impact of recent inflation, the clothing of this brand has been reduced twice on the basis of the original price of 1200 yuan, and the percentage of each reduction is x, so the current price of the commodity is____________ Element (the result is expressed by the formula containing x) 2. If the solutions of equation 6x + 3 = 0 and 5x + k = 20 with respect to X are reciprocal to each other, then the value of K is ______ 3. Define new operations @ for positive rational numbers a and B as follows: a@b = [(ab+b ²)/ (a-b)], then 2@3 =____________ . 4. Calculate 12 ° 17 ' × The result of 4 - 23 ° 24 ′ 36 ″ is ____ 5. If (3 + a) ²+ | B-2 | = 0, then the value of 3a-2b-2012 is ____ 6. If it is known that the complement angle of an angle is 10 ° more than 3 times of its remainder angle, then this angle is equal to ___________

1.120*(1-0.01x)^2
2.k=30
3.-15
4.-11° 7′36″
5.-2025
six point five zero

Six math blanks 1. Limit value of LIM (x-1) sin (1 / 1-x) X tends to 1 2. Let f (x) have a continuous derivative on R, and find ∫ [f (2x)] 'DX 3. Given the number term series Σ∧∞∨ n = 1 UN = 2006, find the limit value of Limun X tends to infinity 4. Given ln (Z / XY), find DZ 5. It is known that f (x) is continuous at point x, and lim [f (x-2x1) - f (x)] / X1 = 1 X1 tends to 0 6. A is a third-order square matrix, ｜ a = (- 1 / 2), find the value of the transpose matrix of [(3a) Λ - 1] - 2A Those who seek results and ideas, know how to solve several ways, fully solve and give ideas, Correct question 5. If f (x) is known to be continuous at point X and lim [f (x-2x1) - f (x)] / X1 = 1, find the value of [f (x1)) ' X1 tends to 0

1、0
2、1/2F（2x）+C
3、0
5、1/2
Try left multiplying matrix A, maybe

6 math blanks Processing a batch of parts is planned to be completed in 28 days. As a result, the task is completed in 25 days, and the work efficiency is improved () For a fraction, the numerator expands three times, the denominator shrinks four times, and the score value is () There is 34 kg of salt water with a salt content of 20%. To make the salt content reach 25%, it is necessary to add () kg of salt A is 25% more than B and B is ()% less than a; J A is 40% of B, and B is ()% more than a The weight of a fish is equal to 1 / 3 of its weight plus 1 / 3 kg. The fish weighs () After 54 tons of a pile of sand are transported away, the rest is 6 tons less than 75% of the pile of sand, which weighs () tons

A batch of parts were processed and planned to be completed in 28 days. As a result, the task was completed in 25 days, and the work efficiency was improved (12%)
For a fraction, the numerator is expanded by 3 times, the denominator is reduced by 4 times, and the score value is (expanded by 12 times)
There is 34 kg of salt water with a salt content of 20%. To make the salt content reach 25%, it is necessary to add (34 / 15) kg of salt
A is 25% more than B and B is 20% less than a; J A is 40% of B, and B is (150)% more than a
The weight of a fish is equal to its 1 / 3 plus 1 / 3 kg. The fish weighs (1 / 2 kg)
After 54 tons of a pile of sand are transported away, the rest is 6 tons less than 75% of the pile of sand, and the pile of sand weighs (192) tons

6 math blanks The sum of three consecutive odd numbers is 129. The largest odd number is (). Decompose it into prime factor () The factors of 54 are (), of which the odd number has (), the composite number has (), the prime number has (), and the even number has () A natural number can be written exactly as the product of two different prime numbers. This natural number has () different factors If the natural number a is 10 times of B, the least common multiple of a and B is (), and the maximum common factor is () A user's phone number is eight digits, from left to right. The fourth digit is the smallest prime number, the fifth digit is the smallest natural number, the sixth digit is the largest single digit, and the other digits are 8. The phone number of this phone is () 7 □ 8 □ represents a four digit number. To divide the four digits by 2, 3 and 5 at the same time, the minimum four digits is (), and the maximum four digits is ()

The sum of three consecutive odd numbers is 129. The largest odd number is (45). Decompose it into prime factor (45 = 3 * 3 * 5)
The factors of 54 are (234 6 9 12 18 27 54), including odd numbers (3927), composite numbers (469 12 18 27 54), prime numbers (23) and even numbers (246 12 18 54)
A natural number can be written as the product of two different prime numbers. This natural number has (4) different factors
If the natural number a is 10 times of B, the least common multiple of a and B is (a) and the maximum common factor is (b)
A user's phone number is eight digits, from left to right. The fourth digit is the smallest prime number, the fifth digit is the smallest natural number, the sixth digit is the largest single digit, and the other digits are 8. The phone number of this phone is (88820988)
7 □ 8 □ indicates a four digit number. To divide the four digits by 2, 3 and 5 at the same time, the minimum four digits is (7080) and the maximum four digits is (7980)

If a four digit number is 5 in the thousands and 6 in the tens, fill in the hundreds and the ones respectively so that the four digits can be divided by 2, 3 and 5 at the same time, then the minimum of the four digits is () If 2x / 5 = 4Y (x and y are not equal to 0), then x: y = (): ()

（1）5160
（2）10：1

Urgent 1、 Fill in the blanks 7. The inspection team inspected a batch of products, a total of 750 pieces were inspected, of which 720 pieces were qualified, and the qualification rate of this batch of products was 8. If the price of a commodity is 180 yuan after 10% discount, the original price of this commodity is () 9. Xiao Li's mother deposited 5000 yuan in the bank for one year with an annual interest rate of 2.25%. When withdrawing, the bank withheld and collected 20% interest tax. When it expires, the interest tax paid is () yuan

1 720/750=96%
2 180/90%=200
3 5000*2.25%*20%=22.5