Eight math questions 8 Thank you, please teach me eight math problems

1)y1=a+ ,y2=

y1 = The slope of the charging function of mall B is larger, so the increase rate is larger, so when the purchase volume is large, it should be purchased from mall A.

2) Let y1=y2, solve x=5, when buying 5 units, the two charges are equal.

Solution: Let the total amount of money spent be y, and the number of units is x (a is a constant greater than 0) 1) A: y=a+(x-1)(1-25)aa(0,75x+

B: y=a 0 A is a one-time function, B is a proportional function, when A = B.

y= x=5 of the solution

y= ﹛y=4a

The two functions intersect at (5,4a).

The B function changes faster.

When x 5 B is on top, when 0 x 5 B is selected.

Pick a when x 5.

2) When five units are purchased by one, it is equal to the analytic formula.

Set up and buy x sets; A is y=a+(x-1)*;

B is y=x*a*;

1) From a functional point of view, the slope of A is; B is; B increases quickly; When the purchase volume is large, go to Mall B to buy it;

2) when equal;

x=5

1 b, the base edge of this right triangle is 13

Let this distance be x

Connect this point to the vertices of the triangle to form three triangles, the distance is the height of the three triangles, and the sum of the areas of the three triangles is equal to the right triangle List the equation (5x+12x+13x) 2=5*12 2 Solve x=2 Choose b

2 a first proves that the sides of this quadrilateral are parallel according to the theorem of the angle bisector, and it can be deduced that all angles are right angles. So it's square.

Solution: Knowing a2+a-1=0 (i), a can be obtained that is not 0(Because when a=0, 0+0-1=-1).

i）/a=a+1-1/a=0.So a-1 a=-1, so (1)a2+1 a2=(a-1 a) 2+2=3(2)(a2)2+1 (a2)2 =(a 2+1 (a 2))-2=9-2=7

3)a+1/a=(a+1/a)^2^(1/2)=(a^2+1/(a)^2+2)^(1/2)=5^(1/2)

-8a（x²-2xy＋y²）

8a（x-y）²

2.Original formula = (a 1 2a) (a 1-2a) = (a 1) (a-1).

22.Multiply both sides by x (x-1) to get.

6x-3x＋3=x＋5

2x=2x=1 is tested to be a root increase, so there is no solution to the equation.

21.(1)-8ax^2+16axy-8ay^2=-8a(x^2-2xy+y^2)

a8(x-y)^2

2)(a^2+1)^2-4a^2

a^2+1+2a)(a^2+1-2a)=(a+1)^2(a-1)^2

22. 6/(x-1)-3/x=(x+5)/x(x-1)6x-3(x-1)=x+5

2x = 2x = 1 because when x = 1 x - 1 = 0

So the equation has no solution (the denominator cannot be 0).

1.Because the coordinates of point b (6,4) and point e are the midpoint of cb, the coordinates of point e are (, and the analytic formula of the inverse proportional function is y and k x, and the value of k is 12

Explain the branch spike in detail and answer it as in the state of thought: fierce Gaobu.

<> Runian side picture is noisy and lossy.

<> look at the buried manuscript and return to filial piety.

<> the plan is to crack and cultivate this and.

4.For a radical to be meaningful, the number under the root number must be greater than or equal to 0, i.e. x-1 y is greater than 06The same goes for 6-x 0 2x+3 0

Solve -3 2 x 6

So the smallest integer is -1

Let's give you an idea, you have to do the questions yourself, 10 questions, connect BC, AP

First, the isosceles triangle is used to prove that ABP and ACP are equal, then the congruent triangle is used to prove that Cap and BAP are equal, and then the APE and APF are congruent.

I glanced at the tenth question, It was too troublesome to solve, so I directly said the method.

Connect to the AP

10 questions, because pb=pc, angle pbc=pcb, because ab=ac, angle abc=acb, so angle abp=acp

Because the vertical and angular abp = acp, pd = pe