（45+5）Y=45X-5X 5X+5Y+45Z=15 45X+5（Y+Z）=15

（45+5）Y=45X-5X 5X+5Y+45Z=15 45X+5（Y+Z）=15

5X+5Y+45Z=15,① 45X+4X+5X=15,
45X+5Y+5Z=15,② X=5/18=Z
（45+5）Y=45X-5X
50y = 40x, substituting into ① to get,
5Y=4X.Y=2/9
① - ② = so, x = z = 5 / 18, y = 2 / 9
-40X+40Z=0,
X = Z

7(x-9-5-7)+0x9+1x5+2x7=y
6(x-5-2-1)+15x1+14x2+13x5=y

1.7（X-21)+0+5+14=Y
7X-147+19=Y
7X-128=Y
2.6(X-8)+15+28+65=Y
6X-48+108=Y
6X+60=Y
Simultaneous subtraction x-188 = 0
So x = 188 brings back y = 1188
Hope to adopt \ (^ o ^)/~

x² +x=--8995000
That's negative 8995000

x² +x=--8995000
x² +x+8995000=0
△

10.75 + 0.4-9.47 calculated by simple formula

10.75+0.4-9.47
=（10.75-9.47）+0.4
=1.28+0.4
=1.68
If you don't understand this question, you can ask,

Resistor r1r2 is connected in series in the circuit, and the voltage at both ends of R1 is 3V
The resistance R1 and R2 are connected in series in the circuit, the voltage at both ends of R1 is 3V, the voltage at both ends of R2 is 9V, R1 + R2 = 600 Ω
1. Total voltage of current
2. Current in a circuit
3. Resistance value of resistance R1 and R2
If the answer is correct and clear, you can give as much as you want

Total voltage U = U1 + U2 = 3V + 9V = 12V
Current I = u / R1 + R2 = 0.02A
In addition, because R1 + R2 = 600 ohm, R1 = 150 ohm and R2 = 450 ohm can be obtained simultaneously
This problem is very simple, take a good look at the textbook. No problem!

Proof: there are innumerable natural numbers K, so that N4 + k is not prime
N4 is expressed as the fourth power of n

Proof: there are innumerable natural numbers K, so that N4 + k is not prime n ^ 4 + 4 * k ^ 4 = n ^ 4 + 4N ^ 2 * k ^ 2 + 4 * k ^ 4-4n ^ 2 * k ^ 2 = (n ^ 2 + 2 * k ^ 2) ^ 2-4n ^ 2 * k ^ 2 = (n ^ 2 + 2 * k ^ 2-2n * k) * (n ^ 2 + 2 * k ^ 2-2n * k). Obviously, if k = 4 * k ^ 4, then n ^ 4 + k = n ^ 4 + 4 * k ^ 4 is not prime, because it can be decomposed into (n ^

What is the resistance voltage of 220 V and 103 ohm?
I want to figure out how much voltage each ohm consumes,

If you don't ask in detail, is it only to add 1 ohm to the circuit or 103 ohm to the circuit? There is no ohm to divide the current equally, but it can be calculated by the formula u = R * I,
What you need is electricity, right?

If the chord a B is a parabola y 2 = 8 x through Q (4,1), and Q is the midpoint of the chord, the equation of the straight line a B is obtained

Let a (x1, Y1), B (X2, Y2) then Y12 = 8x1y22 = 8x2 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; subtract the two expressions to get (Y1 + Y2) (y1-y2) = 8 (x1-x2), so 〈 Y1 − y2x1 − x2 = 8y1 + Y2, and & nbsp; & nbsp; Y1 + Y22 = 1 〉 KAB = 4 linear AB equation: Y-1 = 4 (x-4) & nbsp; namely & nbsp; 4x-y-15 = 0

If the influence of temperature on the resistance is not considered, the resistance of the resistance wire will be ()
A. Unchanged B. half the original C. twice the original D. not sure

The resistance of the conductor is determined by the material, length and cross-sectional area of the conductor. The current passing through a resistance wire becomes the original 12, while the material, length and cross-sectional area of the resistance wire remain unchanged, so the resistance value of the resistance wire remains unchanged

5x-x & # 178; / X & # 178; - 25, where x = - 9, find its solution

5x-x²/x²-25
=x（5-x)/(x+5)(x-5)
=-x/(x+5)
=9/(-9+5)
=-9/4