If the right branch of the straight line y = KX + 2 and hyperbola x2-y2 = 6 intersect at two different points, then the value range of K is () A. (−153，153)B. (0，153)C. (−153，0)D. (−153，−1)

If the right branch of the straight line y = KX + 2 and hyperbola x2-y2 = 6 intersect at two different points, then the value range of K is () A. (−153，153)B. (0，153)C. (−153，0)D. (−153，−1)

The asymptote equation is y = ± x, y is eliminated from y = KX + 2x2 − y2 = 6, and (k2-1) x2 + 4kx + 10 = 0  K ＜− 1 △ = (4K) 2 − 40 (K2 − 1) ＞ 0 {− 153 ＜ K ＜− 1, so D is selected

If there is no solution to the system of inequalities about X, then the value range of M is
If the inequality system 2x-1 about X is greater than 4x + 5, and x-m is greater than - 1, there is no solution

Because 2x-1 is greater than 4x + 5
So x is less than - 3
If x-m is greater than - 1, there is no solution
-1 + m must be greater than or equal to - 3
So m is greater than or equal to - 2

Simple calculation: 19 / 9 - (10 / 9 - 1 / 2)

=19/9 -10/9+1/2
=1+1/2
=3/2

In the arithmetic sequence an, A1 = 1 / 25, the 10th term is larger than 1, and lim (1 / N & sup2; (an + SN) = t, then the value range of T is
The answer is (4 / 75,3 / 50]

a10>1,a9≤1
1/25+9d>1,1/25+8d≤1
d∈(8/75,3/25]
8/75*n-1/15

What are the sum of the following polynomials? What are the coefficients of each term?
-5y²+2πy a+3ab-5b
What are the terms of the following polynomials? What are the coefficients of each term (excluding the constant term)?
-2πR²+2xy/3 -4/5a²-4ab/5-b²+a-6

-5Y & # 178; + 2 π y is the sum of - 5Y & # 178; and 2 π y, the coefficient of - 5Y & # 178; is - 5, the coefficient of 2 π y is 2 π a + 3ab-5b & # 178; is the sum of a, 3AB and - 5B & # 178; the coefficient of a is 1, the coefficient of 3AB is 3, - 5B & # 178; the coefficient of - 5-2 π Q & # 178; + 2XY / 3 is - 2 π Q & # 178; and 2XY / 3, - 2 π Q & # 17

There are two barrels of oil. The second barrel is 1.5 times of the first barrel. Take 2kg out of the second barrel and put it into the first barrel. This is the same weight of the two barrels of oil. How much oil was there in the first barrel

If the first barrel contains XKG oil, the second barrel contains 1.5kg oil
1.5x-2=x+2
0.5x=2+2
0.5x=4
x=8
The first barrel of oil is 8kg

How to find the n-order derivative of y = 1 / (x ^ 2-3x + 2)?

3（x-1）-7（x+5）=30（x+1）

Remove the brackets and get: 3x-3-7x-35 = 30x + 30, transfer and merge: - 34x = 68, change the coefficient to 1 and get: x = - 2

Fluid velocity 12 cubic meters per hour, transmission height of 20 meters of pipe diameter should be

The flow rate of liquid is not only related to the diameter of the pipe, but also to the pressure of the pipe. The measurement of the flow rate is usually cubic per second. The unit you asked is too large. We have made a pipe with 3 cubic per second, which is 0.7MPa and 1.4m in diameter

Is ln (1 + x) and e ^ X-1 infinitesimal?

LIM (x → 0) ln (1 + x) / (e ^ x-1) = 1, so ln (1 + x) and e ^ X-1 are equivalent infinitesimals