1 / 6 = 2 * 1 / 3 = 1 / 2 - 1 / 3 according to this equation, what rules do you find? 15 words or so, good writing plus reward points, reply within five hours,

1 / 6 = 2 * 1 / 3 = 1 / 2 - 1 / 3 according to this equation, what rules do you find? 15 words or so, good writing plus reward points, reply within five hours,

The reciprocal of the product of two continuous natural numbers is equal to the difference of their reciprocal

8, - 9.25, minus one sixth, - 502,47%, 31.7, three eleventh, minus 0.3 cycle, minus one and half, - 15, twenty-two fifths, - 60,
Negative three fifths, - 3.12013, - 0, - 2, four fifths, - 3.5, fifteen fifths, - 50 (fill these numbers in positive integer, negative integer, integer, positive fraction, negative fraction respectively)

Positive integers: 8,252013, negative integers: - 9, - 502, - 15, - 60, - 2, - 50, integers: 0, 8,252013, - 9, - 502, - 15, - 60, - 2, - 50, positive fraction: 47%, 3 / 11, 22 / 5, 31.7, 3 / 5, 4 / 5, 15 / 7, negative fraction: 1 / 6, 0.3 cycle, 1 / 2

Proof: there are infinitely many natural numbers K, so that n ^ 4 + k is not prime
It's proved by factorization. Finally, it seems that the range of values must be explained to show that each factor is greater than 1,

Do you still need a license?
For any natural number n, let k = m * n, m belong to natural number, then there are:
N^4 + K
= N^4 + MN
= N(N^3 + M)
When n = 1, n ^ 3 is equal to 1, so as long as M is an odd number greater than or equal to 3, n ^ 3 + m is an even number greater than 2, and must be a composite number
When n > 1, as long as n ^ 3 + m > 1, n ^ 4 + K has two factors greater than 1, it must be a composite number. When n > 1, n ^ 3 + m > 1 is a natural number for M
In conclusion, there are infinitely many natural numbers m, that is, there are infinitely many natural numbers K, so that n ^ 4 + k is not prime

A resistance R is equal to 100 ohm. To make one-third of the total current pass through R, it should be connected with a resistance

Parallel a 50 ohm resistor
In parallel circuit, the total current is equal to the sum of branch currents

Given the parabolic equation y square = 8x, find the linear equation of the chord of the parabola bisected by point a (1,1)

What is the relationship between resistance and temperature

To see what material, the relationship is not necessarily
For the material with positive temperature coefficient, the higher the temperature is, the greater the resistance is;
For negative temperature coefficient material, the higher the temperature, the smaller the resistance
There are also some materials whose resistance has little to do with temperature

Solving two solutions of X & # 178; - 12x + 9 = 0

X^2-12X+36-27=0
(X-6)^2=27
X-6=±3√3
X=6±3√3

How much electricity does a 25 watt bulb consume in 30 minutes

25 watts, 40 hours for 1 kwh, 30 hours for 0.75 kwh

Y = x ^ 3-ax + 6 in X ＞ 1 monotone increasing for a =?
Y = x ^ 3-ax + 6, where x > 1 is an increasing function, the value range of a is obtained

First question: y = x ^ 3-ax + 6, so y = x (x ^ 2-A) + 6. It can be regarded as a function, as long as (x ^ 2-A) > 0
So when a = 1, (x ^ 2-A) > 0 holds
The second question: it's the same, as long as (x ^ 2-A) > 0, so x ^ 2 > A, the solution is a

What does power supply 3n-50 hz-380 / 220 V mean?

3N means three fires and one zero, and "50 Hz" means alternating current with a frequency of 50 Hz. 380 / 220 V means that two kinds of alternating voltages of 380 V and 220 V can be obtained in this circuit. Don't mislead "the phase voltage is 220 V and the line voltage is 380 V". What you said is right. The phase voltage in this circuit is 220 V, but 3n-50 Hz -... "