How to prove that the n-th power mantissa of a natural number with mantissa 76 is 76?

How to prove that the n-th power mantissa of a natural number with mantissa 76 is 76?

Let two different natural numbers with mantissa of 76 be
100A + 76 100b + 76 A, B is a natural number
Then (100a + 76) (100b + 76) = 10000ab + 7600 (a + b) + 5776 = 100 (100ab + 76a + 76b + 57) + 76
It is also a natural number with a mantissa of 76
So the natural number with mantissa 76 has mantissa 76 to the second power
If you multiply it by itself, it's a natural number with a mantissa of 76
and so on
The mantissa of natural numbers with mantissa of 76 is to the nth power

How much does a meter of bvv4 square copper wire weigh

100m 4.6kg

It is known that the system of quadratic equations 4x + 7Y = − 19 (1) 4x − 5Y = 17 (2), and equation (1) subtracts (2) to get ()
A. 2y=-36B. 2y=-2C. 12y=-2D. 12y=-36

(1) (2) get: (4x + 7Y) - (4x-5y) = - 19-17, that is 12Y = - 36, so D

Knife switch is 220V 10a, how many a fuse should be used?

Answer:
This depends on the protective current of your load. For example, if the protective current of an electrical appliance is only 3a, then if a 10A fuse is installed, there will be no protective effect

1 / m * (X-Y) is a fraction, please explain

It depends on whether M is an unknown number
If M is an unknown, then M is a fraction
If M is not an unknown, then it is not a fraction

The voltage of home circuit will be reduced to 198v during the peak period of power consumption. Under this voltage, the actual power of a "220 v.100 W" bulb will be reduced______ 100W (select "greater than", "less than" and "equal to"), the brightness of the bulb is higher than that of the normal light______ Some. (light or dark)

(1) "220 V, 100 W" light bulb means that the rated voltage of the light bulb is 220 V and the rated power is 100 W. when the voltage at both ends of the light bulb is equal to 220 V, the power of the light bulb is equal to 100 W and the small light bulb will light normally; (2) when the voltage at both ends of the light bulb is greater than 220 V, the power of the light bulb is greater than 100 W and the small light bulb will light brightly; when the voltage at both ends of the light bulb is less than 220 V, the power of the light bulb is less than 100 W and the The light bulb is dark. (3) the actual voltage is 198v, less than the rated voltage of 220V, so the actual power is less than the rated power of 100W, the light bulb is dark

First simplify and then evaluate a & # 178; - B & # 178; / A & # 178; - 2Ab + B & # 178; + 2a-ab / B-2 △ a

a²-b²/a²-2ab+b²+2a-ab/b-2÷a
=（a+b）（a-b）/(a-b)²+a(2-b)/(b-2）÷a
=（a+b）/（a-b）-1
=(a+b-a+b)/(a-b)
=2b/(a-b)
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After the appliance with rated voltage of 6V is connected in series with a resistance of 4 Ω, it is connected to the power supply, and it works normally. At this time, the circuit current is 0.5A, then the resistance of the appliance is () Ω, and the power supply voltage is () v. what is the formula

The electrical resistance is r = u / I = 6 / 0.5 = 12 Ω
The power supply voltage is u total = (R + R) * I = (12 + 4) * 0.5 = 8 v

As shown in the figure, this is a slide in the water park. Put slide ad flat on the ground, just coincident with ab. if BC = 4m, CD = 2m, find the length of slide ad

Let ad = x, ∵ ad = AB, CD = EB = 2m, ∵ AE = X-2, in RT △ ade, ad2 = AE2 + de2, that is, X2 = (X-2) 2 + 42, the solution is: x = 5, that is, the length of slide ad is 5m

How much electricity does a 100 watt lamp consume in 10 hours

1 degree (because 1 kwh is exactly 1 degree)