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The weight ratio of goods in warehouse A and warehouse B is 7:8, If 6 tons are transported into warehouse A, warehouse a will have 14 tons more than warehouse B, The original goods in warehouse A are () tons emergency Formula explain
A x 7 / 8 = A / b. 8 / 7 A = B. B = 8 / 7X
Goods in warehouse A - goods in warehouse B = 14
（X+6）-（8/7X)*3/4=14
. simplification
4X=224
X=56
X + 6 is the cargo of A
8 / 7X is B's
3 / 4 is 3 / 4 of B after 1 / 4 is shipped out
Senior two mathematics solution equation (x ^ 2 + 2) ^ 2 + 198 = 29 (x ^ 2 + 2) please write a program
(x^2+2)^2+198=29(x^2+2)
（x^2+2）²-29（x^2+2）+11*18=0
（x^2+2-11）（x^2+2-18）=0
Ψ X & sup2; = 9 or 16
Ψ x = ± 3 or ± 4
"A rectangle is six fifths of a meter long and two fifths of a meter wide. How many meters is its circumference?
Big brothers and sisters, 1
2*6/5+2*2/5=16/5
Its circumference is 16 / 5 meters
In an equal ratio sequence {an}, Sn is the sum of the first n terms. If Sn = 48, s2n = 60, then s3n is equal to?
Understand the language
The Sn, s2n Sn and s3n-s2n of equal ratio sequence are also equal ratio sequence, that is, 48,12 and s3n-60 are equal ratio, s3n-60 = 12 ^ 2 / 48 = 3, s3n = 63
The number of n is three times of x minus four thirds of Y, and the difference is ()
A two digit number, the number of ten is a, the number of one is B, this number is ()
A school bought 20 football and 30 basketball, which cost 1120 yuan. It is known that the price of football is 1.5 times that of basketball, so the unit price of football is () yuan?
It is known that 0.4% of 84 diluted disinfectant water can be used to purify air. 40 kg diluent needs () kg 84 stock solution; 2 kg stock solution can prepare () kg disinfectant water
You can draw () lines and () rays after a point, and () lines or rays after two points
If the height of a cuboid is increased by 2 cm, it will become a cube, and the surface area will be increased by 56 square cm. The original cuboid volume is () cubic cm
Two lines that do not intersect are called parallel lines
Use 45 cm long and 30 cm wide bricks to make a cube, at least such bricks are needed
A、6 B、7 C、8 D、9
Practical questions
1. For a job, it takes 10 days for Party A to do it alone, and one eighth of that for Party B. how much of that can be done in four days?
2. The distance between port a and port B is 334 km. Passenger ships and cargo ships sail from each other at the same time. After 4.5 hours, they are still 100 km apart. Passenger ships sail 28 km per hour, and cargo ships sail how many km per hour?
3. Two bags of glass balls, each bag has the same number of balls. Take out 120 balls from bag a and 180 balls from bag B. the remaining glass balls in bag a are just four times of bag B. how many balls are there in each bag?
4. There are 56 students in the fourth grade participating in the art group, which is three times more than the number of the music group. How many people are there in the music group
5. There is a batch of coal in the factory. It was originally planned to burn 4 tons a day for 40 days. After the improvement of the stove, 0.8 tons can be saved every day. How many days can this pile actually burn
6. There are 750 kg salt water, 20% salt, 8% salt after adding some water. How many kg water are added?
7. Xiao Liang and his father take a taxi for an outing. The rent is 5 yuan for less than 10 kilometers, and 0.3 yuan for each kilometer for more than 10 kilometers. When they get off the bus, Xiao Liang pays a total of 9.2 yuan. How many kilometers has the taxi line taken?
The toy factory produced a batch of toys, which was originally planned to be completed in 15 days, but actually produced 300 pieces per day. In this way, not only the task was completed in 12 days, but also 150 pieces were exceeded. How many pieces were originally planned to be produced per day?
Formula calculation
What is the product of the sum of 3 / 2 plus the quotient of 4 / 1 divided by 4 / 3 multiplied by 5?
4 and 9 / 3 - (0.3-9 / 7) =?
Four times more than m, the number of n is (4m + n). Three times of x minus four-thirds of Y, the difference is (3x-4 / 3Y). A double-digit number, the number of ten is a, the number of one is B, this number is (10a + b). A new school bought 20 football and 30 basketball, sharing 1120 yuan
As shown in the figure, the cross section of a reservoir dam is trapezoidal ABCD, the width of the dam crest is 3 meters, the height of the dam is 2 meters, the slope of the back slope AB is 1:1, and the slope angle of the upstream slope CD is 30 °. The length of the dam bottom ad is calculated
Be ⊥ CF ⊥ ad, CF ⊥ ad, e and f respectively through B and C, then be ⊥ CF and ∵ BC ∥ ad, ∵ BC = EF & nbsp; be = CF from the title meaning, EF = BC = 3, BF = CF = 2, ∵ the slope of backwater slope AB = 1:1, ∫ BAE = 45 °, AE = be × cot45 ° = 2 × 1 = 2DF = CF · cot30 ° = 2 × 3 = 23
Fourth grade primary school mathematics, we help to solve it, thank you
A number, change to write "ten thousand" as the unit, and reserve one decimal place, then it is seventy thousand, the maximum number is (), the minimum number is ()
A number, rewritten as "hundred million" and retained two decimal places, is 300 million. The maximum number is (). The minimum number is ()
Help the solution of the above two questions, the fourth grade of primary school, ordinary paper, I was baffled.. everyone help to solve it, thank you
A number, changed to "ten thousand" as the unit, and retain a decimal place, the number is 70000, the maximum is (70499), the minimum is (65000)
A number, which is rewritten as "hundred million" and retained two decimal places, is 300 million. The maximum number is (30499999) and the minimum number is (250000000)
The relationship between the determinant of matrix 2a and the determinant of matrix A
How can five five's add, subtract, multiply and divide be equal to 10
5 times 5 minus 5 minus 5 = 10
Let a be a square matrix of order 4 and the rank of a be 2, then the rank of a * is obtained
The rank is 0
Because the rank of matrix A of order 4 is 2, its third-order formulas must all be 0 (otherwise the rank will be 3)
Since all the third-order subformulas are 0, then according to the definition of adjoint matrix, its elements are all 0, that is, it is a 0 matrix, so its rank is 0
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