If the solution set of inequality ax & sup2; + BX + 2 > 0 is {| - 1 / 2

If the solution set of inequality ax & sup2; + BX + 2 > 0 is {| - 1 / 2

Obviously - 1 / 2 and 1 / 3 are the roots of the corresponding equation AX ^ 2 + BX + 2 = 0
So Veda's theorem
-1/2+1/3=-b/a
-1/2×1/3=2/a
a=-12
b=-2
So A-B = - 10

If the solution set of inequality 2x + 13 + 1 ＞ ax − 13 is x ＜ 53, then a should satisfy ()
A. a＞5B. a=5C. a＞-5D. a=-5

The solution set of 2x + 13 + 1 ＞ ax − 13, 2x + 1 + 3 ＞ AX-1, 2x ax ＞ - 5, X (2-A) ＞ - 5, ∵ inequality 2x + 13 + 1 ＞ ax − 13 is x ＜ 53, ∵ 2-A ＜ 0, ∵ 2-A = - 3, the solution is a = 5, so B

If the solution set of inequality 3 / 2x + 1 + 1 > 3 / AX-1 is x less than 3 / 5, then what is the value of a

6/13

If the circumference of a circle is equal to that of a square, what is the ratio of the area of a circle to that of a square?

2*PAI*R=4*A
R/A=2/PAI
S circle / s positive = Pai * r * r / (a * a)
=PAI*(2/PAI)^2
=4/PAI

Given that a.b.c.d is four different integers, and ABCD = 25, find the value of a + B + C + D

Obviously, a, B, C, D can only be 1, - 1,5, - 5, so the sum is 0
Because the four integers are different and 1 * 2 * 3 * 4 = 24, it is impossible
So there must be negative numbers, so there are only two positives and two negatives
And 25 = 5 * 5
5 is prime, so it can only be plus or minus 5

If a trinomial formula only contains the letters X and y, the degree of each term is 2, and the coefficient of each term is - 1, what is the polynomial?
Need process and answer

-X^2-XY-Y^2

Given radius and angle, how to calculate chord length and arch height
Radius 2, angle 30, how to find chord length and arch height

Chord length = 2 * sin15 ° * 2 arch height (vector height) f = (square of diameter - (chord length / 2) square) square root

An applied problem about summation of equal ratio sequence
A ball is dropped from a place of 16cm, and it will reach 70% of the previous height after each bounce. Ask the sum of the vertical distances that the ball has passed after the eighth bounce (that is, how many cm it has traveled in total)
The second question is the sum of the distances until it can no longer bounce
Find the determinant
We list Sn = 16x70% (1-70% to the eighth power) / 1-70% and Sn = 16x70% / 1-70%
(sum formula of equal ratio sequence) but it's wrong. I don't know what's wrong
Ask math talent ~ thank you

The distance of rebound and fall in your formula is not calculated
S1=16+16*70%*2*（1-70%^8）/(1-70%)
S2=16+16*70%*2/(1-70%)
The first drop is 16, then each time to the desktop is two rebound height

Xiaoqiang and Xiaoling discuss the solution of the equation 2x + 3 = 3x + 2. Xiaoling writes 2x + 3 = 3x + 2x-2 = 3x-3, 2 (x-1) = 3 (x-1) 2 = 3, how can we get 2 = 3

The solution of the original equation is x = 1
So we can't eliminate (x-1) on both sides of the equation at the same time, so it's meaningless. It's equivalent to dividing both sides of the equation by 0

30 English compositions in grade one with translation of 50 words

My Good Friend My good friend is Mei.She ’s a girl.She is my classmate.Mei is tall and thin.She has two big eyes and long hair.She likes listening to music and reading books.Sometimes we listen to mus...