If there are two rational numbers a and B satisfying (A-1) (B-1) > 0, what is the relationship between them and 1?

If there are two rational numbers a and B satisfying (A-1) (B-1) > 0, what is the relationship between them and 1?

They all need to be 1

If A. B is a rational number, a > 0, b > 0, and | a|

If A. B is a rational number, a > 0, b > 0, and | a|

Given that rational number a = negative a, simplify rational number A-1 minus rational number A-2

(a-1)-(a-2)
=a-1-a+2
=1
It has nothing to do with the value of A

The fourth power of X - the square of 5x - 36 = 0

(x²+4)(x²-9)=0
X & # 178; + 4 = 0 has no solution
therefore
x²-9=0
x=-3,x=3

Given that x is an integer and (x + 3) 2 + (3-x) 2 + (X & # 178; - 9) 2 + (2x + 18) is an integer, then the value of X is=

It can be reduced to 2 (x + 3) / (X & # 178; - 9) + 2 (x-3) / (X & # 178; - 9) + (2x + 18) / (X & # 178; - 9) = 6 / (x-3)

In the expansion of binomial (2x2 − 1x) 6, the constant term is ()
A. 30B. 48C. 60D. 120

The general term tr + 1 = Cr6 (2x2) & nbsp; 6 − R (− 1x) & nbsp; r = (- 1) r26-rc6rx12-3r of binomial expansion can be r = 4 if 12-3r = 0, then T5 = 22c64 = 60, so choose: C

Given the function f (x) = ax ^ 2 / X-1 (a ∈ R, X ≠ 1) 1, if a = 1, and X ＞ 1, find the minimum value 2 of function f (x), and solve the inequality f (x) ≥ ax about X

1. ∵ a = 1, X ﹥ 1 ∵ f (x) = x & # 178; / (x-1) = (X & # 178; - 1 + 1) / (x-1) = [(x + 1) (x-1) + 1] / (x-1) = x + 1 + 1 / (x-1) = X-1 + 1 / (x-1) + 2 ≥ 2 + 2 = 4, the equal sign holds only when X-1 = 1 / (x-1), that is, when x = 2, f (x) gets the minimum value of 4.2. F (x) ≥ ax, (a ∈ R, X ≠ 1)

1. Find the tangent equation passing through a point m (5,0) outside the circle x square + y square = 5,

If the tangent slope does not exist, then x = 5, the distance from the center to x = 5 = 5, not equal to √ 5. If the slope exists, then y-0 = K (X-5) kx-y-5k = 0, the distance from the center to the tangent = | 0-5k | / √ (k ^ 2 + 1) = √ 5 | = √ (5K ^ 2 + 5) 25K ^ 2 = 5K ^ 2 + 5K ^ 2 = 1 / 4K = 1 / 2, k = - 1 /

A household electric energy meter has 3000r / kWh on it. If the meter is used to measure the power of the terminal electric appliance, the turntable turns 15 times in 3 minutes
He usually gives an ammeter next to him to ask for the power of the electric appliance or something,

3000r / kW. H means that when the turntable rotates for 3000 revolutions, the electrical appliances consume one kilowatt hour (1kW. H), that is, one degree of electricity. 1kW. H = 1000W * 1H = 1000 * 3600 seconds = 3600000 = 3.6 * 10 ^ 6J 1kW. H / 3000 = 1200J, that is to say, every revolution of the turntable, the electrical appliances do 1200J work, and the power of the electrical appliances P = 15 *

But I forgot
Xiaoxiao was 48kg last year and 47kg this year
His weight this year is less than last year

(48-47)/48=2.08%