1. If the two teams cooperate in greening the campus, it can be completed in six days; if they work alone, team B will spend five more days than team a, and how many days will each team work alone? 2. From team a to team B, go down the mountain first and then go on the level road. Someone goes down the mountain by bike from team a at the speed of 12 kilometers per hour, and passes through the level road at the speed of 9 kilometers per hour. When he comes back, he goes through the level road at the speed of 8 kilometers per hour, and goes up the mountain at the speed of 4 kilometers per hour. It takes 1.5 hours to get the distance between team a and team B Please use one variable linear equation to solve, do not use binary linear equation

1. If the two teams cooperate in greening the campus, it can be completed in six days; if they work alone, team B will spend five more days than team a, and how many days will each team work alone? 2. From team a to team B, go down the mountain first and then go on the level road. Someone goes down the mountain by bike from team a at the speed of 12 kilometers per hour, and passes through the level road at the speed of 9 kilometers per hour. When he comes back, he goes through the level road at the speed of 8 kilometers per hour, and goes up the mountain at the speed of 4 kilometers per hour. It takes 1.5 hours to get the distance between team a and team B Please use one variable linear equation to solve, do not use binary linear equation

1) It takes X days for team a to work alone and 6-x days for team B to work alone,
6-x-x=5,
x=1/2
Team B takes x = 11 / 5 days
It takes 1 / 2 and 11 / 2 days for the two teams to work alone
2) When you go up the mountain, the distance is x kilometers, and the distance is y kilometers,
x/12+y/9=55/60,
x/4+y/8=3/2
x=3,
y=6,
x+y=9
The distance between B and a is 9 km

1. Given 4a-2b + C = 0, 9A + 3B + C = 0, then the vertex of the quadratic function y = ax & sup2; + BX + image may be in ()
A. First or fourth quadrant B, third or fourth quadrant B
c. First or second D, second or third
2. Given the quadratic function y = 2x & sup2; + 9x + 34, when the independent variable x takes two different values X1 and X2, the function values are equal, then when the independent variable x takes X1 + X2, the function values and ()
A. The values of functions with x = 1 are equal
B. The values of functions with x = 0 are equal
C. The values of functions with x = 1 / 4 are equal
D. The values of functions with x = - 9 / 4 are equal

1
The two formulas are subtracted to get a + B = 0
Because a is not zero, neither a nor B is zero
So, the axis of symmetry x = - B / 2A = 1 / 2
So choose a
two
y=2(x+9/4)²+34-81/8
x1+x2=-9/4*2=-9/2
It should be equal to x = - 9 / 2
Here's the method
Let's see if there are any wrong numbers in the title

A and B go to a store to buy the same product twice, and the price is different each time. The buyers are different. A buys 1000 kg each time, B buys 1000 yuan each time
(1) What is the average unit price of the goods purchased by Party A and Party B?
(2) Which is the best way to buy?

The title is incomplete

For a two digit number, the number in the ten digit number is 5 smaller than that in the one digit number. If the two digit positions of the two digit number are exchanged, a new two digit number is 45 larger than the original two digit number
It's an identity, but how do you answer that? How do you write it? It's due tomorrow.

I was the first to answer~
Enumeration, this kind of tens: 16,27,38,49 are kinds, you can find that each one meets the requirements!
Because you set the number on the digit x, you can make an equation and find that it is an identity!

As shown in the figure, in the rectangular trapezoid ABCD, ad ‖ BC, ∠ C = 90 °, BC = 16, DC = 12, ad = 21. The moving point P starts from point D and moves along the direction of ray DA at a speed of 2 units per second on ray da. The moving point Q starts from point C and moves towards point B at a speed of 1 unit per second on line CB. The points P and Q start from point D and C at the same time. When point Q moves to point B, point P stops Let the time of motion be t (seconds). (1) let the area of △ bpq be s, and find the functional relationship between S and T; (2) when t is the value, the triangle with B, P, Q as the vertex is isosceles triangle; (3) when PQ and ab intersect at O, and 2ao = ob, find the tangent of ∠ BQP; (4) whether there is time t, such that PQ ⊥ BD? If it exists, find the value of T; if not, explain the reason

(1) As shown in the figure, if passing point P is PM ⊥ BC and perpendicular foot is m, then the quadrilateral pdcm is rectangular.. PM = DC = 12. ∵ QB = 16-t, ∵ s = 12 × 12 × (16-t) = 96-6t (0 ≤ T < 16); (2) from the figure, we can see that CM = PD = 2T, CQ = t

Observe the following input 0, 7, 26, 63, 124. The law of arrangement. What is the 100th number? What is the nth number (n is a positive integer)? Use the formula containing n to express the reason and result. Good + points

1. The third power of 100 - 1 = 999999
2. The third power of N - 1
The third power of reason 0 = 1-1
The third power of 7 = 2-1
The third power of 26 = 3-1
The third power of 63 = 4-1
The third power of 124 = 5-1

1. For the quadratic equation of one variable (a + C) x & # 178; + BX + (A-C) / 4 = 0 with two equal real roots, then the triangle with a, B and C as sides is（
A. A right triangle with a hypotenuse
B. Right triangle with hypotenuse C
C. Isosceles triangle with B as base
D. Isosceles triangle with C as base
2. Solve the equation | X & # 178; Y & # 178; - 4 | + ((3 √ 5) x-5y-10) & # 178; = 0
Sorry for missing a minus sign
|x²-y²-4|+((3√5)x-5y-10)²=0

The first choice a
According to the spherical root formula b * B-4 (a + C) (A-C) / 4 = 0
b*b-a*a+c*c=0
Second question
What's your number between 3 and 5?
According to the fact that the sum of several nonnegative numbers is equal to zero, then these nonnegative numbers are equal to zero

|3.14-π|-π=
There are () negative integers with absolute value equal to 3 and ()
If a and B are opposite to each other, then 1 / 3 (a + b)=
Calculate the value of | a | + | B | according to the following conditions
①a=-3 b=0
②a=1.7 b=-2.3
Given | x-4 | + | y + 1 | = 0, find the value of X and y
If | 1-m | + | n + 2 | = 0, then the value of M + n is

|3.14 - π | - π = (π - 3.14) - π = - 3.14 there are (1) negative integers with absolute value equal to 3, and integers have (2) [|a | = 3, then a = ± 3] if a and B are opposite numbers, then 1 / 3 (a + B) = 0 [then a + B = 0] calculate the value of |a | + | B | (1) a = - 3 B = 0 - |a | + | B | = | - 3 | + 0 = 3, ② a =

The sum of the two prime numbers is 25. How many times is the smaller prime number?

Because the sum of the two prime numbers is 25, the two prime numbers are odd and even, and the prime number of even is only 2,
So these two prime numbers are 2 and 23, respectively
The small prime number is 2 / 23 of the larger prime number
The larger prime number is 23 △ 2 = 11.5 times of the smaller prime number

What is a 5 / 6 fractional unit? It contains several such units. Adding several such fractional units, it becomes the smallest prime number

The fractional unit is 1 / 6, which contains 5 and 7 1 / 6, so 2 is the minimum prime