For any real number x, if the inequality 2kx ^ 2 + kx-8 / 3 < 0 holds, then the value range of real number k is? It's a process~

For any real number x, if the inequality 2kx ^ 2 + kx-8 / 3 < 0 holds, then the value range of real number k is? It's a process~

2kx ^ 2 + kx-8 / 3 ＜ 0
So 2K < 0
k^2-4*2k*(-8/3)＜0
So 64 / 3 < K < 0

For any real number x, the inequality 2kx & sup2; + kx-3 / 8 holds and the value range of K is obtained
For any real number x, the inequality 2kx square; + kx-3 / 8 holds, and the value range of K is obtained
Inequality less than 0

From the graph of function, we can see that there must be K

What is the simple algorithm of 99 times 36 plus 99

(100-1)*36+(100-1)
=3700-37
three thousand six hundred and sixty-three

It is known that the polynomial-5 / 6x ^ 2Y ^ m + 2 is a hexanomic quaternion, and the degree of the monomial 2 / 3x ^ 5Y ^ n is the same as that of this polynomial. Find the value of M, n

∴2+m+2=6 5+n=6
∴m=2 n=1

The first monthly examination paper
Just simulate

How many degrees is thirteen degrees and thirty minutes

Because 100 is one degree
So 13 degrees 30 minutes is 13.3 degrees

There is a scenery in my heart

Scenery in my heart a scenery in my heart is a beautiful child of nature. Feeling people's inner world, it is a rural scenery, simple but not luxurious, generous and noble. In the morning, the sun just showed its beautiful posture, her light, gentle but not fierce. And people? Get up early to make breakfast, every family

Class_____________ Name________________ Achievements_____________
(1) Calculate the surface area and volume (unit: cm). (16 points)
(2) Find the volume. (unit: cm) (3 points)
ten
6、 Problem solving (33 points)
(1) The diameter of the bottom is 3 decimeters, and the height is 4? (ten square decimeters reserved)
(2) The front wheel of a roller is a cylinder with a width of 2 m and a diameter of 1.2 m. if it rotates for 5 turns, how many square meters will it roll?
(3) A cylindrical granary, measured from the inside, has a bottom diameter of 3 meters and contains 2.5 meters of wheat. If each cubic meter of wheat weighs 0.7 tons, how many tons of wheat does the granary contain?
(4) A pile of cone-shaped yellow sand has a circumference of 25.12 m at the bottom and a height of 1.5 m. it weighs 1.5 tons per cubic meter. How many tons does this cone-shaped yellow sand weigh?
(5) A cylindrical plasticine has a bottom area of 12 cm2 and a height of 5 cm. If you shape it into a cone of the same size as the bottom, what is the height of the cone?

1) Floor area plus side area
2) 5 times the side area
3) 7 times volume
4) 1.5 times volume
5) Because the volume of a cone is one third of that of a cylinder, the height of a cone should be three times that of a cylinder
I can only tell you the method, and in the future the problem can be solved quickly

It is known that a smaller root of the equation x2-2x + k = 0 (k is an integer) of X is x0, and - 1 "x0" 0 can find the value of integer K

According to the discriminant △ = 4-4k ＞ 0  K ＜ 1, the equation is solved: x = 1 + radical (1-k) or x = 1-radical (1-k) ∵ radical (1-k) ≥ 0 ∵ 1-radical (1-k) ＜ 1 + radical (1-k) ∵ - 1 ≤

How to calculate 99 times 38 plus 99

99×38+99
=99×(38+1)
=99×39
=(100-1)×39
=3900-39
=3861