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Solving inequality - x square + 2x + 15 〈 0
x^2-2x-15>0
(x-5)(x+3)>0
x> 5 or X
The solution set of X − 2A ＞ 42x − B ＜ 5 is 0 ＜ x ＜ 2, then the value of a + B is equal to______ ．
X − 2A ＞ 4, ① 2x − B ＜ 5, ②, from ①, X ＞ 2A + 4, from ②, X ＜ B + 52, ∵ the solution set of X − 2A ＞ 42x − B ＜ 5 about X is 0 ＜ x ＜ 2, ∵ 2A + 4 = 0b + 52 = 2, a = − 2B = − 1, ∵ a + B = - 2-1 = - 3, so the answer is - 3
The solution of quadratic inequality 2 (x-1) (x + 1) - 4 (x + 2) 2 + 15 ＜ 0
∵ 2 (x-1) (x + 1) - 4 (x + 2) 2 + 15 < 0, ∵ 2 (x2-1) - 4 (x2 + 4x + 4) + 15 < 0, ∵ 2x2-16x-3 < 0, ∵ 2x2 + 16x + 3 > 0. ∵ x1, 2 = − 16 ± 162 − 4 × 2 × 32 × 2 = − 4 ± 582, ∵ the solution set of inequality is {x | x ＞− 4 + 582, or X ＜− 4 − 582}
What is the solution set of inequality - x2 + (1 / A + a) X-1 > 0? (14 19:16:56)
If 0 < a < 1, then the solution set of inequality - x2 + (1 / A + a) X-1 > 0 is?
x²-(a+1/a)x+10
(a+1)a(a-1)>0
Three zeros, - 1,0,1
So - 11 / A
1/a
12+14+18+116+132+164+1128．
12+14+18+116+132+164+1128，=1-12+12-14+14-18+18-116+116-132+132-164+164-1128，=1-1128，=127128．
Given the sine current I1 = 70.7sin (347t-30 °) a, I2 = 60sin (314T + 60 °) A. find the sum of the sine current I1 and I2
Given the sine current I1 = 70.7sin (314t-30 °) a, I2 = 60sin (314T + 60 °) A. find the sum of the sine current I1 and I2
At the time of physical examination, Xiao Gang was 1.57cm in height
At the time of physical examination, Xiao Gang was 1.57cm in height, which was rewritten as the number of meters (1.57m)
What are the factors of 30 and 2O from 1 to 30
First, find out the factors of 30 and 20
The factors of 30 are 1,2,3,5,6,10,15,30
The factors of 20 are 1,2,4,5,10,20
So 1 to 30 is both a factor of 30 and a factor of 20
1,2,5,10
In linear algebra, is zero matrix multiplied by any matrix equal to e? For example, what is 0 (matrix) multiplied by a (matrix)?
Zero matrix multiplied by any matrix equals 0 (matrix)
The teacher took the students to go boating, with an average of 6 people each, just full of 8. If each boat takes 7 people, at least how many boats to rent
7
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