The square of (- A's Square (B's fourth power) and (B's third power)

The square of (- A's Square (B's fourth power) and (B's third power)

The square of (- A's Square (B's fourth power) and (B's third power)
=The square of (- A's Square (B's 12th power))
=The square of (- A's Square, B's 12th power)
=The fourth power of a is the 24th power of B

Y = x divided by the square of x minus one, how to find the range of X less than or equal to negative 2
Who can help me decide,

y＝x/(x²－1)
＝1/2[1/(x＋1)＋1/(x－1)]
∵x≤－2
∴x＋1≤－1,x－1≤－3
∴1/(x＋1)≥－1,1/(x－1)≥－1/3
∴1/2[1/(x＋1)＋1/(x－1)]≥1/2(－1－1/3)＝－2/3
That is, the range of y = x / (X & sup2; - 1) is [- 2 / 3, + ∞)
∵ x is a real number, and the discriminant △≥ 0
That is 1 + y

Set a = {X - 2 ≤ x ≤ 5}, B = {x m + 1 ≤ x ≤ 2m-1}. When x belongs to R, if a ∩ B = empty set, find the value range of real number M

A ∩ B = an empty set. Because a is not an empty set, there are two cases
1) B is an empty set, M + 1 > 2m-1, i.e. M = 2, but a ∩ B = an empty set, i.e. 2m-15, i.e. M4, so m > 4
By synthesizing 1), 2), the value range of M is: M4

If 1 < a < 3, then p = (4-A & # 178;) (9-A & # 178;) and 24

1

The base of a parallelogram is 8cm, the height is 4cm, the area is (), and the area of a triangle with the same base and height is ()

32；16

Solve the equation: 32-5 / 6 x = 26, what is x equal to?

7.2

If the tangent equation of curve y = x2 + ax + B at point P (0, b) is X-Y + 1 = 0, then the values of a and B are ()
A. 1，1B. -1，1C. 1，-1D. -1，-1

∵ y '= 2x + a | x = 0 = a, ∵ curve y = x2 + ax + B at point (0, b), the slope of the tangent equation X-Y + 1 = 0 is 1, ∵ a = 1, and the tangent point X-Y + 1 = 0, ∵ 0-B + 1 = 0 ∵ B = 1

One 7x (one 3) x (0.5) + (one 12) x (2.6) rational number operation

Is there a real number a such that the maximum value of the function y = sin ^ 2x + acosx + 5A / 8-3 / 2 in the closed interval [0, π / 2] is 1

Y = sin ^ 2x + acosx + 5A / 8-3 / 2 = 1-cos & # 178; X + acosx + 5A / 8-3 / 2 = - (cosx-a / 2) &# 178; + A & # 178; + 4 + 5A / 8-1 / 2  0 ≤ x ≤ π / 2,  0 ≤ cosx ≤ 11) when 0 ≤ a ≤ 2, then the maximum value of cosx-a / 2 = 0y is: A & # 178; + 5a-12 = 0, solution a = 3 / 2, a

If the difference between a number and its reciprocal is 14 / 15, what is the number

The number is - 14 / 15 or 15 / 14
14 and 14 / 15 (both 29 / 210)
Let this number be X. according to the meaning of the question, we get: X-1 / x = 29 / 210
（x²-1）/x=29/210
210（x²-1）=29x
210x²-29x-210=0
(15x+14)(14x-15)=0
15x + 14 = 0 or 14x-15 = 0
X = - 14 / 15 or x = 15 / 14
Go back and check:
When x = - 14 / 15, - 14 / 15 - (- 15 / 14) = - 14 / 15 + 15 / 14 = - 196 / 210 + 225 / 210 = 29 / 210
So x = - 14 / 15 fits
When x = 15 / 14, 15 / 14-14 / 15 = 225 / 210-196 / 210 = 29 / 210
So x = 15 / 14 also fits
To sum up, this number is - 14 / 15 or 15 / 14
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