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(1) Inject water into a rectangular tank with a length of 2 decimeters and a width of 1 decimeter. When the water in the tank appears square for the second time, inject () liters in total (2) Party A and Party B have the same two cups. Cup a has only half a cup of water, and cup B is filled with 50% salt water. First pour half of cup B salt water into cup a, mix well, and then pour half of cup a salt water into cup B. at this time, the salt in cup B accounts for (- ---) of the salt water
(1) Inject water into a rectangular tank with a length of 2 decimeters and a width of 1 decimeter. When the opposite surface of the water in the tank is square for the second time, inject a total of (4) liters. (2) Party A and Party B have the same two cups. Cup a has only half a cup of clean water, and cup B is filled with 50% salt water. First pour half of cup B of salt water into cup a, mix well, and then
【1】 The ratio of the circumference of a circle to its radius is [] 【2】 The latter item of 9:10 is increased by 19. To keep the ratio unchanged, the former item should be increased by []
【1】 The ratio of the circumference of a circle to its radius is [2 π]
【2】 The latter item of 9:10 is increased by 19. To keep the ratio unchanged, the former item should be increased by [17.1]
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1. A rectangle is three fifths of the width. If the width increases by 8 cm, the rectangle becomes a square. The original circumference of the rectangle is (?) cm and the area is (?) cm2? 2. A simplest integer ratio is two fifths if its front term adds 1, and one fifths if its front term subtracts 1. The simplest integer ratio is (?):)
1. A rectangle is three fifths of the width. If the width increases by 8 cm, the rectangle becomes a square. The original circumference of the rectangle is (64) cm and the area is (240) square cm?
2. A simplest integer ratio is two fifths if its front term is added with 1, and one fifths if its front term is subtracted from 1. The simplest integer ratio is (3): (10)
3 math blanks 1. There are three points a, B and C on the plane. Draw a straight line through each two points, and you can draw at most____ A line segment can be drawn at least____ A straight line 2. Take three points a, B and C on the straight line L____ A ray____ A line segment 3. Given the line segment AB = 5cm, intercept BC = 2cm on the line segment AB, then AC=_____ cm.
1. There are three points a, B and C on the plane. Draw a straight line through each two points, and you can draw at most__ 3__ A line segment can be drawn at least__ 1__ A straight line
2. Take three points a, B and C on the straight line L___ 6_ A ray__ 3__ A line segment
3. Given the line segment AB = 5cm, intercept BC = 2cm on the line segment AB, then AC=__ 3___ cm.
Attachment: the six rays in question 2 are rays AB, AC, BC, CB, Ca and ba
Segment AB, AC, BC
3 math blanks If both a and B are non-O natural numbers and satisfy, then 3 / A + 7 / b = 21 / 16, then a + B = () If 1 / a = B + 5 / a = 1 / 9 (both a and B are natural numbers and a ≠ 0), then B = () A + B = 420, a ÷ B = 3A of 7 = (), B = ()
1、a+b=4
2、76
3、a=126, b=294
1. Simplify 2:14 / 5 to () and the ratio is () 2. The sales of a large supermarket in the second quarter increased by 10% over that in the first quarter. The sales in the second quarter was ()% of that in the first quarter, the sales in the second quarter was ()% of that in the first quarter, and the sales in the first quarter was ()% less than that in the second quarter (one decimal place is reserved before the percentage sign) 3. The monthly salary of an employee of a company is 4600 yuan. According to the relevant provisions of personal income tax, 3% of the personal income tax shall be paid for the income exceeding 3500 yuan and less than 5000 yuan, so the monthly salary of the employee of the company shall pay personal income tax () yuan
(1 ）5：7 5|7
（2）110 9.0
（3） 33
RELATED INFORMATIONS
- 1. 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
- 2. Who knows about mathematician stories, interesting mathematical stories, and mathematical knowledge? I want to make a handwritten newspaper, as long as it is about mathematics! Please help me find more and shorter, because I want to make a manual copy! thank you very mnsh! I repeat, shorter!
- 3. What are the properties of translation and axisymmetry? What about rotation?
- 4. Give some examples of the constant movement of molecules in life The more, the better. A little more detail = = | (just a little more detail.)
- 5. Is the pendulum of a pendulum moving in translation or rotation The sooner the better
- 6. What is the teaching orientation of symmetry, translation and rotation? How to distinguish symmetry, translation and rotation in life?
- 7. The idiom describing water flow, please 3Q
- 8. Log (a ^ k) (m ^ n) = (n / k) log (a) (m) (n ∈ R) how to prove it? Please do not use the bottom changing formula
- 9. Please explain the difference between log and LG and LN, as well as their formulas,
- 10. When light passes through a glass plate, its intensity should be reduced by 1 / 10, and the intensity of light should be reduced to less than 1 / 3 of the original. At least such a glass plate; (answer: 11) How to solve it with log?
- 11. 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 ___________
- 12. Optimization of mathematics class hour of Beijing Normal University in Grade 7 1.8 complete square formula
- 13. The connection and difference between translation and rotation is
- 14. What are the properties of rotation
- 15. The third unit of the second day of junior high school summarizes that the differences and similarities of axisymmetry, rotation and translation are the same
- 16. If the image of the square of the function y = x is perpendicular to the tangent of the function image translated by the vector a = (m, 1) at x = 1, then M= nothing
- 17. On the buoyancy of ships and stones entering the sea from the river I know that because the density of river water is different from that of sea water, the water level of ship entering the sea rises But also into the sea, the stone has always been at the bottom. Has its density changed?
- 18. How do we know the temperature outside the high air plane?
- 19. Is the buoyancy equal to the force on the object?
- 20. Several blank filling questions in Mathematics ① A number consists of 4 percentages, 3 ones and 48 percentages. This number is () ② The product of two factors is 8.42. If one factor is 10 times larger than the other factor, the decimal point of the other factor moves two digits to the left, and the product is () ③ Two out of nine molecules increase by 6. If the fraction size remains the same, the denominator should increase ()