How to do this math problem

First of all, let's analyze this diagram: from a on the positive half axis of the y-axis, we can know that c must be positive. Since one of the corners of this parallelogram is known, we can find the left side of the three points of abc, which is represented by b c.

The most obvious of these is the left side of point a, we only need to set x to zero, we can get a(0,c), according to the properties of the parallelogram, we can deduce the coordinates of bc, and then we can bring in the parabolic equation to get a system of equations to find bc.

Solution: Let x=0 calculate y=c, then the coordinates of point a are (0,c);

and parallelogram abo=45°, then ao=bo, i.e., b(-c,0);

According to the nature of the parallelogram, abo= aco=45°, then in the same way, the coordinates of point c are (c,c);

According to the nature of the parabola, we can know that the axis of symmetry is x=-b 2(7 6-c), then the coordinates of point c can also be expressed as (-b (7 6-c),c);

Then the equation is obtained: c=-b (7 6-c)......

Bringing the coordinates of point b into the parabolic equation yields: (7 6-c)c 2+b (-c)+c=0 divided by c on both sides to obtain (7 6-c) c-b+1=0.........

Simultaneous equations , b 1 2, c 3 2;

Bringing in the original formula, the analytical formula of the quadratic function is y 1 3x 2 1 2x 3 2

After the first question comes out, the second question is simple, you calculate the analytic formula of oc out y x, and bring it into the analytic formula of the quadratic function to calculate a x1 and an x2, one of which is the coordinates of point c, and the other is the coordinates of point d.

It's pretty detailed......

I can't see it, you might as well come down by yourself!

Foot abo is 45 degrees, ao=bo=c, the coordinates of point b are (-c,0), use the formula (-b-root number under b*b-4ac) 2a=-c, the coordinates of point a are (c,0),a=7 6-c, find the relationship between b and c, bring (-c,0) into the original formula, and the relationship between b,c is combined, then a,b,c is found. The equation for co is the simultaneous of y=x and the obtained quadratic formula, and the coordinates of the intersection are obtained.

In fact, it is very simple, b(-c,0),c(c,c) This you should know, and then substitute the coordinates of these two points into the analytical formula to find b and c, although there will be a "cubic square", but it can be approximated immediately, and it is not troublesome to calculate.

ps: You're Luo Zhong, right?

3x x-1=3 multiplied, x (x-1)=1 y(x-1 x)-(3x x-1)+1=0

y-3 y+1=0 Both sides are multiplied by y at the same time

y2+y-3=0

Isn't 3x x-1 equal to 2? You made a mistake!!

100c2

ncrn is the first few lines.

R+1 is the first.

Solution: Let the per capita growth rate be x

13 times x to the power of 30 is less than or equal to 18

Calculating the maximum value of x is the answer sought.

The average annual growth rate should not be exceeded.

The square of the formula is calculated based on the area of the circle

It's the radius, what the area formula is, I forgot. You can substitute the radius and you're good to go.

Calculate the area of the circle.

The radius is meters. s=

Subtraction of two formulas = 2x -7x+2-x +5x=x -2x+2

x-1)²+1

Because the square of a certain number must not be less than 0, the subtraction of two formulas is greater than or equal to 1,2x -7x + 2>x -5x