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Anonymous users2024-02-0754 in total;
s=123252；s=123654；s=126456；s=141252
s=141654；s=144456；s=162456；s=165252；s=165654
s=222456；s=225252；s=225654；s=243252；s=243654
s=246456；s=261252；s=261654；s=264456；s=321252
s=321654；s=324456；s=342456；s=345252；s=345654
s=363252；s=363654；s=366456；s=423252；s=423654
s=426456；s=441252；s=441654；s=444456；s=462456
s=465252；s=465654；s=522456；s=525252；s=525654
s=543252；s=543654；s=546456；s=561252；s=561654
s=564456；s=621252；s=621654；s=624456；s=642456
s=645252；s=645654；s=663252；s=663654；s=666456；
As for the algorithm, I calculated it with a program, so there are only answers;
If we use the soil method, that is, b, f and d must be even, e must be 0 or 5, for c then a + b + c is a multiple of 3, that is to say, when a is 1, b is 1, c is 1, 1 + 1 + 1 is a multiple of 3; According to this idea, those puzzles are simple.
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Anonymous users2024-02-06I know that a number e is 0 or 5, hehe!
Upstairs means you didn't ask him!
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Anonymous users2024-02-05Let the total effort be x, then:
The amount of work that A completes on a daily basis alone is.
1/5*x4=1/20x
The amount of work done by B alone on a daily basis is.
1/5*x3=1/15x
If A and B are combined, the sharing time is:
x÷（1/20x＋1/15x）
x = 9 days for both teams to take 1
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Anonymous users2024-02-04Regardless of whether the 40-meter side is close to or far from the river, the grass is square, and the variable length is 40 meters, so the area is 40x40=1600 (square meters).
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Anonymous users2024-02-03The length of the other side = 120 2-40 = 20m
Area = 40 * 20 = 800 square meters.
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Anonymous users2024-02-02The other side is 120 2-40 = 20m, so the area is 40 * 20 = 800 (square meters).
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Anonymous users2024-02-01What shape? Didn't tell how to ask.
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Anonymous users2024-01-311.First of all, you need to know that the product of each factor 2 and factor 5 will add 1 0932 = 2*2*233 at the end
There are 2 factors 2 and 3 factors 5
To make there are 4 0s at the end, you also need 2 factors 2, 1 factor 5, so the minimum in parentheses should be: 2*2*5=20
2.Each trip up the mountain is 1 km and takes 1 to 3 hours.
The descent is 1 km per line and takes 1 to 5 hours.
1 km round trip, a total of 2 km.
Required: 1 3 + 1 5 = 8 15 hours.
The average speed is: 2 8 15 = km/h.
3.The round-trip journey is the same.
The return speed is 4 5 out of the road
Then the time taken to drive out is 4 5 to drive back
Sail out takes: 6 (4 5) (4 5 + 1) = 8 3 hours Maximum departure of the ship: 30 8 3 = 80 km.
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Anonymous users2024-01-30It's better for you to search online on your own.
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Anonymous users2024-01-2972 grams of white cream were used, and each cake was used in grams, so a total of 72 cakes were processed, and 15* grams of colored cream were used.
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Anonymous users2024-01-28Solution: A food processing plant has processed a total of x of this kind of cakes, so
x=15 (pcs).
So: the amount of colored cream should be: grams).
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Anonymous users2024-01-2772).
15 grams) A: A total of 42 grams of colored cream.
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Anonymous users2024-01-26is an increase in surface area.
is the volume of wood.
Putting it all together, you can write 15x(
Hope it will be helpful for you to learn and progress
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Anonymous users2024-01-25The base area is square decimeters.
So the volume is cubic decimeters. ~o(∩_o
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Anonymous users2024-01-24The square of the increase in the surface area is the square of the base area.
Volume = cubic decimeter.
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Anonymous users2024-01-23After being sawn in two, there are two more bottom surfaces than the original, that is, the bottom area of the cuboid is, that is, so the volume is cubic decimeters.
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Anonymous users2024-01-22The area of the base surface of the box).
Box volume).
A: The volume of wood is cubic decimeters.
1.88 * 3 - 92 * 2 = 80 (points) 80 points for Chinese.
2.Total number of fruit trees: 120 20% = 600 (trees) 200 600 = of the total number of fruit trees accounted for by the vines. >>>More
60*2 (book).
Zu Chongzhi's outstanding achievement in mathematics is about the calculation of pi Before the Qin and Han dynasties, people to"Trail three times a week"As pi, this is"Ancient rate"Later, it was found that the error of the paleorate was too large, and the pi should be"The circle diameter is more than three days", but how much is left, opinions differ Until the Three Kingdoms period, Liu Hui proposed a scientific method for calculating pi"Circumcision", use the circumference of the circle inscribed regular polygon to approximate the circumference of the circle Liu Hui calculates that the circle is inscribed with 96 polygons, and obtains =, and points out that the more sides of the inscribed regular polygon, the more accurate the value obtained Zu Chongzhi on the basis of the achievements of his predecessors, after hard work, repeated calculations, found In between and and obtained the approximate value in the form of fractions, taken as the approximate rate , taken as the dense rate, where the six decimal places are taken, it is the fraction of the closest value of the numerator denominator within 1000 What method did Zu Chongzhi use to get this result, Now there is no way to examine if it is assumed that he will press Liu Hui's"Circumcision"If you want to find this method, you have to calculate that the circle is connected with 16,384 polygons, which requires a lot of time and labor! It can be seen that his tenacious perseverance and intelligence in his scholarship are admirable Zu Chongzhi's calculation of the dense rate, it has been more than a thousand years since foreign mathematicians achieved the same result In order to commemorate Zu Chongzhi's outstanding contributions, some foreign historians of mathematics have suggested that = be called"Ancestral rate"． >>>More
The above methods are all algorithms with equations, 75=2100 (meters) It is also the deformation method of equations, which is not practical for elementary school students who are not good at equations, and the general primary school students feel that the reasoning learning method is easier to use and easy to understand than equations, so I will use a reasoning method to solve this problem! >>>More
Primary school math Olympiad problems, please don't use the method of column equation solving, which does not help primary school students. >>>More
Khan ...I'll help you with this.