How to solve this math problem, how to solve this math problem?

Angle BEA = Angle ECB + Angle CBE = 90 degrees + Angle BCD + Angle CBE = 90 degrees + Angle A + Angle ABE= 90 degrees + Angle BEC That is, angle BEA - Angle BEC = 90 degrees, Angle BEA + Angle BEC = 180 degrees.

If you want to solve this problem, then you should first think about how he will solve it. Then you should think about his topic, and then draw an image of it in a sketchbook and analyze it.

The remainder is 1 minus 1 2 is multiplied by 1 2, minus 1 3 is multiplied by 2 3, minus 1 4 is multiplied by 3 4, and so on minus 1 2010 is multiplied by 2009 2010, so the final result is 2010*1 2*2 3*3 4**2009 2010 adjacent numerator denominator offset, the result is 1 If you are satisfied, please select "can solve the problem" when commenting, if you are not satisfied.

1.First, find the first derivative of the function, and the result is a quadratic function, the part greater than 0 is the increasing function, and the opposite part is the subtraction function, (and then the second derivative is obtained to obtain the inflection point).

2.Find the vertices of the second-order function, (x=1 3, y omitted, solve by yourself), the axis of symmetry.

3.According to the inflection point, you can draw a rough graph of the original function, and you can distinguish the monotonicity.

Please solve the following math problems in the same way as in the second grade of elementary school, but not equations. There are three kinds of fruits, apple solution: apple + banana = 12 banana + pineapple = 20 apple + pineapple = 18 apple + pineapple + banana = 25 so.

Judging by the conditions of Rohr's theorem.

Hello, I'm sorry, I'm not very good at math, I can't understand what you sent, and I can't answer it for you.

Solution: Because the angle PBC = 42 degrees.

Angular PCB = 12 degrees.

Angular PBC + Angular PCB + Angular BPC = 180 degrees.

So the angle BPC = 126 degrees.

Because angle apb + angle APC + angle BPC = 360 degrees, angle APB = 234- angle APC

Because the triangle ABC is a regular triangle.

So the angle abc = angle bac = angle acb = 60 degrees.

Because the angle abc = angle abp + angle PBC = 60 degrees.

So the angle abp = 18 degrees.

Because the angle ACB = angle ACP + angle PCB = 60 degrees.

So the angle ACP = 48 degrees.

Because the angle apb + angle abp + angle bap = 180 degrees angle pac = 80 - angle bap

So the angle pac = 180 - angle apb = 162 - (234 - angle apc) because the angle pac + angle apc + angle acb = 180 degrees, so the angle pac = 132 - angle apc

So 132-angle apc = 162-234 + angle apc so angle apc = 102 degrees.

So the angle pac = 30 degrees.

Regular triangle, all three angles are 60 degrees, triangle inner angles and 180 degrees, BPA+APC=360-BPC=360-(180-42-12)=234

abp=60-42=18 acp=60-12=48pac=180-apc-48=60-bap=180-18-bpa=180-18-(234-apc)

apc=102 pac=30

y=600-50x (0 x ruined Huai 12) I hope it will help you.

If He Chun has questions, you can ask them.

Thank you.

Set x 4 m x 3 nx - 16

x - 2)(x - 1)p(x), where p(x) is a quadratic polynomial, which is substituted by x 2 and x 1, respectively.

8m 2n 0, m n 15, the solution is m -5, n 20, so mn -100. Select C

x－8y）（x－y）＋（x－2y）（x＋2y）(x^2-xy-8xy+8y^2)+(x^2-4y^2)x^2-xy-8xy+8y^2+x^2-4y^22x^2-9xy+4y^2

3b＋2a）（－3b＋2a）－（a－b）²(2a+3b)(2a-3b)-(a^2-2ab+b^2)4a^2-9b^2-a^2+2ab-b^23a^2+2ab-10b^2

x－5y）²－x＋2y）（x-2y）

x^2-10xy+25y^2-x^2+4y^229y^2-10xy

This kind of problem should be done step by step, and you will definitely be able to make it by memorizing the formula.

All direct 1Original formula = x2-9xy + 8y2 + x2-4y2 = 2x2-9xy + 4y2 = (2x-y) (x-4y).

2.Original formula = 4a2-9b2-(a2-2ab+b2)=3a2+2ab-10b2

3.Original formula = x2-10xy+25y2-(x2-4y2)=29y2-10xy

Set to elapse for x seconds.

According to the title: 24-2x=5(x+4).

x=4 7 (sec).

The initial distance of A and B is 4, and the speed difference is 1, so the time for B to catch up with A is 4 seconds, at this time, A and B are at 0 o'clock, C walks 12 in 4 seconds, C and B are 32 apart at this time, and when C and B are 2 apart, that is, C and B go 30 together

30 (3+2)+4=10 seconds.

It takes 10 seconds from the start of the exercise to the time when C and B are 2 apart.

Visually it's a girl's word.,It's still a young lady in the first year of junior high school.。