Who will do the math for me!! Which math whiz can help me!! Find detailed process !!

Set up a building[x+5] Abbreviation.

Filial piety and hunger profit = 1000 [400-x 20] [x+5] 1000 [300x-20 x square return +2000] quietly.

Remove the invariant items.

300x-20 x squared.

At the same time, 20 gets 15x-x squared.

5+7=12 [layers].

or 5+8=13 [layers].

I want to rate.

Hehe, there are an infinite number of solutions to this problem, and to be precise, CE DF can determine a line segment, so be it, how can the mass part of this problem be left ...... it

There is also a condition that is not said: CD and EF are each symmetrical with respect to AB, and CD EF is divided into 3 equal parts AB.

Then the straight line formed by the sum is parallel to ab and the distance from ab is.

First ab:y=3x-10

Find ce: y=3x-10 + 10

df:y=3x-10-√10

Find cd: y=-1 3x+410 9

ef:y=-1/3x +320/9

Calculate their intersection.

It is also possible to use geometric methods to find in triangles

1.Set a has x yuan. B has Y yuan. x+y=1800;x-40%x=y-200 can be calculated from the equation A and B's original deposit.

2.It turned out to be x kilograms. x-40%x-(40%-12)=28 to find x is the original number of kilograms.

20+20+20=60

20 + 5 + 5 = 30 Note that the blue petals are 5 at this time, so one petal is 15-2 = 3

1 + 20 4 (4 petals at this point) = 81

Safflower is twenty.

Five-petal jacaranda is five, and four-petal blueflower is four. The yellow flower is one.

81, the number of petals of orchids is changing, and a few flowers represent a few.

Solution: From the sinusoidal theorem we get bc sina = 2r, we get sina - root 3 2 bc is the longest side, and the triangle is a non-equilateral triangle.

a=2pai/3

sinb+sinc=sinb+sin(pai 3-b)=sin(b+pai 3), again 0 root3 2< sin(b+pai 3)<=1, the value range of sinb+sinc is (root3 2,1]< p>