Add, subtract, multiply and divide the 15 3's into an equation equal to 2004, and add, subtract, multiply and divide the 15 3's into an equation equal to 200

Add, subtract, multiply and divide the 15 3's into an equation equal to 2004, and add, subtract, multiply and divide the 15 3's into an equation equal to 200

(3*3*3*3-3-3)*3*3*3-3*3-3-3-3-3=2004
3*3*3*3*3-3*3*3-3*3-3*3+(3+3)/3=200

If the equation x2 + ax + B = 0 has two equal real roots, then the relationship between a and B is______ ．

∵ equation x2 + ax + B = 0 has two equal real roots, ∵ △ a2-4b = 0, ∵ B = A24. So the answer is b = A24

How to find the periodicity of trigonometric function
Why are the periods of y = asin (Wx + α) and y = ACOS (Wx + α) 2 π / | w|

How can I change the equation to y = asin (Wx + &) and y = ACOS (Wx + &)
f(x)=Asin(wx+&)=Asin(wx+2π+&)=Asin[w(x+2π/w)+&]=f(x+2π/w)
So the period is t = 2 π / W;
The other is exactly the same

If the function f (x) = tanwx (W > 0) has two adjacent tangent lines y = a, and the length of the line segment is 6 π, then f (π)=

The length of the obtained line segment is 6 π, that is, the period T = 6 π
So w = 2 π / T = 1 / 3
f(x)=tan(x/3)
F (π) = Tan (π / 3) = radical 3

Answers to the first volume of the sixth grade mathematics exercise book

15 × 80 △ [15 × (1-20%)] saving 20% than the plan is 80% of the original plan, so multiplying the original plan by 80% is the actual daily burning. Then divide the total amount of coal by the actual daily burning

For the correct process, it is known that the length of the minor axis of the ellipse is 2, the center of the ellipse coincides with the vertex of the parabola y ^ 2 = 4x, and a focus of the ellipse is the focus of the parabola. The equation and eccentricity of the ellipse are obtained

Analysis
b=2
The center is (00)
The focus of parabola 2p = 4
p=2
So focus (10)
So the ellipse has C = 1
b=2
a2=5
So the equation
x2/5+y2/4=1
Children's shoes

How to answer the 7 questions on page 45 of the fifth volume of primary school mathematics?
Lele and Taotao start from the south gate and the north gate of the school at the same time and walk in opposite directions. Lele walks 60 meters per minute and Taotao walks 70 meters per minute. They meet at a distance of 50 meters from the midpoint. How many meters is the distance between the south gate and the North gate of the school?

2x50 ÷ (70-60) x (70 + 60) = 1300 (m)

Judge the position relationship between the straight line (x + 3) / (- 2) = (y + 4) / (- 7) = Z / 3 and the plane 4x-2y-2z-3 = 0

Direction vector s of straight line (x + 3) / (- 2) = (y + 4) / (- 7) = Z / 3 = (- 2, - 7,3)
Normal vector n = (4, - 2, - 2) of plane 4x-2y-2z-3 = 0
∵s·n=-2×4+7×2-3×2=0
A line is parallel to a plane
Answer: parallel

If it's urgent, just give it a little more. It's ok if there's no answer

1、 Write the number directly. (10 points in total) 760-403 = 300 △ 12 = 0.5 + 7.61 = 2.56-0.37 = 25 × 40 = 132 △ 100 = 36.3 × 100 = 98 + 125 = 7.2 + 2.8 = 321-99 = 4.13-2.8 = 31 × 4 = 3600 △ 18 = 50 × 60 = 26 + 84 = (14 + 25) × 4 = 5.4-2.5-1.4 = 8 × 99 + 8 = 1

What's the area of this square? Its perimeter is 40 decimeters

Side length: 40 △ 4 = 10 decimeters
Area: 10x10 = 100 square decimeters