Using factorization to solve univariate cubic equation: (1) x ^ 3-3x ^ 2 + 4 = 0 (2) 2x ^ 3-3x ^ 2-2 = 0 We all know a root, and we hope to have a detailed decomposition method 2x^3-3x^2+1=0

Using factorization to solve univariate cubic equation: (1) x ^ 3-3x ^ 2 + 4 = 0 (2) 2x ^ 3-3x ^ 2-2 = 0 We all know a root, and we hope to have a detailed decomposition method 2x^3-3x^2+1=0

(1)x^3-3x^2+4=0
x^3-3x^2+2x-2x+4=0
x(x-1)(x-2)-2(x-2)=0
(x-2)[x(x-1)-2]=0
(x-2)(x+1)(x-2)=0

Solution equation: (x + 10) + (X-15) = 280-x, x + 15 = 3 * (109-x) 5 (3x-1.4) = 2 (6x-0.5) 3 (x + 0.9) = 5 (x-1.7) 13x-4 (...)
solve equations:
(x+10)+(x-15)=280-x
x+15=3*(109-x)
5(3x-1.4)=2(6x-0.5)
3(x+0.9)=5(x-1.7)
13x-4(2x+5)=17(x-2)-4(2x-1)

x+10+x-15=280-x 2x-5=280-x 3x=285 x=95x+15=327-3x 4x=312 x=7815x-7=12x-1 3x=6 x=23x+2.7=5x-8.5 11.2=2x x=5.613x-...

How to solve 2x ^ 3 + 3x ^ 2-3x-2 = 0?

The original formula can be reduced to 2 (x ^ 3-1) + 3x (x-1) = 0 2 (x-1) (x ^ 2 + X + 1) + 3x (x-1) = 0 (2x ^ 2 + 5x + 2) (x-1) = 0 (2x-1) (X-2) (x-1) = 0, so x = 1 / 2 or x = 2 or x = 1

To make a square iron wire frame with the edge length of 3DM, a total of 36d iron wire is needed. () to find out how much cardboard to use for making a rectangular carton without cover is to find out the surface area of the rectangular problem
judge

Right and wrong

What is Nikolay Tesla and his Tesla coil
Google's Avatar has become this thing. What is it?

Thanks to Tesla for any electrical thing you can touch today

The length of a rectangular cardboard is 24cm and the width is 18cm. The square of the same size is cut off at its four corners and folded to make a box without cover
The area of the bottom of the box is half of the area of the original rectangle

Let the height be x centimeters
Then (24-2x) (18-2x) = 24 * 18 △ 2
4x²-84x+216=0
x²-21x+54=0
(x-3)(x-18)=0
And 18-2x > 0
x

The total amount of work of a project is fixed. What is the proportion between working hours and working efficiency

awesome DashGirl3.
Working time × working efficiency = total amount of work (fixed), product is fixed, in inverse proportion

Use a piece of fan-shaped paper with a center angle of 72 degrees and an area of 62.8 square centimeters to roll it into a large cone. The area of the bottom of the cone is______ Square centimeter

62.8 △ 72360 = 314 (square centimeter) the square of the radius of the circle is: 314 △ 3.14 = 100 (square centimeter) 100 = 10 × 10, so the radius is 10 centimeter, 2 × 3.14 × 10 × 72360 = 62.8 × 15 = 12.56 (centimeter) 12.56 △ 3.14 △ 2 = 2 (centimeter) 3.14 × 22 = 3.14 × 4 = 12.56 (square centimeter) answer: the area of the bottom of the cone is 12.56 square centimeter

Calculate and check the following questions
73.3-4.46=
354.36+47.7=

73.3-4.46 = 68.84 checking calculation 68.84 + 4.46 = 73.3
354.36 + 47.7 = 402.06 checking calculation: 402.06-47.7 = 354.36

On a square board with a circumference of 80 cm, saw the largest circle. What is the area of the circle in square cm?

The side length of the square is: 80 △ 4 = 20 (CM), the area of the circle is: 3.14 × (20 △ 2) 2, = 3.14 × 102, = 3.14 × 100, = 314 (square cm). Answer: the area of the circle is 314 square cm