If the rational numbers a and B satisfy | ab-2 | + | 1-B | = 0, Let's try to find one of ab ＋ (a ＋ 1) (B ＋ 1) ＋ (a ＋ 2) (B ＋ 2) ＋ ＋﹙a＋2011）﹙b＋2011 A value of 1 / 2

If the rational numbers a and B satisfy | ab-2 | + | 1-B | = 0, Let's try to find one of ab ＋ (a ＋ 1) (B ＋ 1) ＋ (a ＋ 2) (B ＋ 2) ＋ ＋﹙a＋2011）﹙b＋2011 A value of 1 / 2

∵|||||||||||||||||||||+ ||||||||||||||||||||||| One of + (a + 2011) (B + 2011) = 1 / (1 * 2) + 1 / (2 * 3) + 1 / (3 * 4) +. + 1 / (2012 * 2013) = 1-1 / 2 + 1 / 2-1 / 3 + 1 / 3

If the rational numbers a and B satisfy | ab-2 | + (1-B) ^ 2 = 0
Try to find 1 / AB + 1 / (a + 1) (B + 1) + 1 / (a + 2) (B + 2) + + 1/(a+2007)(b+2007)

|ab-2|+(1-b)^2=0
So ab-2 = 0, 1-B = 0
The solution is b = 1, a = 2
1/ab + 1/(a+1)(b+1) + 1/(a+2)(b+2) + …… + 1/(a+2007)(b+2007)
=1/（1×2）+ 1/（2×3 ） + 1/（3×4）+ …… + 1/(2008×2009)
=1/1-1/2+1/2-1/3+1/3-1/4+1/4-1/5 +…… +1/2008-1/2009
=1-1/2009
=2008/2009

The sequence {an} is an arithmetic sequence with non-zero tolerance, and A5, a8 and A13 are three adjacent terms of the arithmetic sequence {BN}. If B2 = 5, then BN = ()
A. 5•(53)n−1B. 5•(35)n−1C. 3•(35)n−1D. 3•(53)n−1

∵ {an} is an arithmetic sequence with non-zero tolerance, and A5, A8, A13 are the adjacent three terms of the arithmetic sequence {BN}, ∵ (A5 + 3D) 2 = A5 (A5 + 8D), ∵ A5 = 92d, ∵ q = A5 + 3da5 = 152d92d = 53, ∵ B2 = 5, q = 53, ∵ B1 = b2q = 3, ∵ BN = b1qn − 1 = 3 · (53) n − 1

750 cubic decimeter = cubic meter 5 ● 5 L = milliliter 7 ● 5 L = cubic decimeter 3500 ml = cubic centimeter

750 cubic decimeter = 0.75 cubic meter
5 ● 5 L = 5500 ml
7 ● 5 L = 7.5 cubic decimeter
3500 ml = 3500 CC

On April 14, 2010, Yushu, Qinghai Province, was hit by a 7.1 earthquake. Ten trucks were organized to transport 50 tons of a, B and C relief materials to the disaster area
According to the plan, 10 vehicles are to be shipped, each vehicle can only carry the same material, and must be full,
Item a B C
Carrying capacity per vehicle / ton 6.54
Freight per ton of materials / RMB 300 400 250
(1) Let X be the number of vehicles carrying a substance and y be the number of vehicles carrying B substance
Y = 10-2x
(2) If there are no less than two vehicles carrying each kind of material, how many are the vehicle arrangements? Write down each arrangement,
(3) If you want to minimize the freight, which arrangement should be adopted? And find out the minimum cost
Note: and... Please hurry up·····

It's 50 tons, so
6x+5y+4z=50
x+y+z=10 ==》z=10-x-y==>4z=40-4x-4y
6x+5y+40-4x-4y=50 ==> 2x+y=10
x,y,z>=2
2x+y=10 ==>
1.y=2.x=4.z=4
2.y=4.x=3,z=3
3.y=6 x=2,z=2
Because of C

How many cubic meters of wood and tons can a train skin hold?

Wood is not necessarily much square, but the tonnage is a dead number, there are container type, single container more than 27 tons. There are car, 58 tons

11 out of 4 minus 5x is 27 out of 10

It's 7 out of 125

The surface area of a cube is 54 square meters. How many cubic centimeters is the volume of the cube?

What is the area of each face of a cube
54 △ 6 = 9 (M2)
because
3×3＝9
So the edge length of a cube is 3 meters
What is the volume of a cube
3 × 3 × 3 = 27 cubic meters = 27 million cubic centimeters

True or false: in proportion, is the difference between the product of two internal terms and the product of two external terms 0?

In proportion, the difference between the product of two inner terms and the product of two outer terms is 0
The product of two internal terms = the product difference of two external terms = 0

Solving math problems in grade six of primary school
Xiao Ming's height is 5 / 6 of teacher Yang's, and Zhang Liang's height is 11 / 10 of Xiao Ming's. The result of multiplying 5 / 6 by 11 / 10 is that ()'s height is 11 / 12 of ()'s
In "the speed of a train is 1 / 4 faster than that of a car", the unit "1" is (), the speed of a train = () + () * 1 / 4, or the speed of a train = () * (1 + 4)
The feeding group raised 20 chickens, the number of ducks was 4 / 5 of that of chickens, and the number of geese was 3 / 4 of that of ducks
(1) What is the number of geese raised by the feeding group?
The budget for a school to build an experimental building is 900000 yuan. Later, due to the need, the budget was increased by 1 / 10. In the process of construction, due to technological innovation, the actual cost was reduced by 2 / 15. How much money was actually used to build the experimental building?
Fill in the blanks of the first two questions and answer them directly. The last two questions are practical questions. If you want to write a calculation test, I want to verify it

Xiao Ming's height is 5 / 6 of Mr. Yang's, and Zhang Liang's height is 11 / 10 of Xiao Ming's. The result of multiplying 5 / 6 by 11 / 10 is that Zhang Liang's height is 11 / 12 of Mr. Yang's