If the square + (M + 3) x + 4 of polynomial x is a complete square, then the value of M is? Fast

m+3=±4;
m=-3±4;
M = 1 or - 7;
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It is known that m and N are the midpoint of AB and AC on both sides of the triangle ABC, P is any point on Mn, extending BP, CP intersecting AC and AB on K and h. to prove: ah / HB + AK / KC = 1
Be as specific as possible

It is proved that the extension lines of EF ‖ BC and CH, BK intersect at e, F through a
Because m and N are the midpoint of AB and AC on both sides of the triangle ABC
From the median line theorem
MN‖BC‖EF,
So EP / PC = an / NC = 1, FP / Pb = am / MB = 1
So EP = PC, FP = Pb
And ∠ EPF = ∠ BPC
So △ EPF ≌ CPB
So EF = BC
Also EF ‖ BC
So △ EHA ∽ CHB, △ AKF ∽ CKB
So ah / HB = EA / BC, AK / KC = AF / BC
So ah / HB + AK / KC = EA / BC + AF / BC
Ah / HB + AK / KC = (EA + AF) / BC = EF / BC = 1
So ah / HB + AK / KC = 1

What are the last three digits of the 1999 power result of 1999?

What is the law of the last three digits of 1999 ^ n
999 when n is odd
When n is even, it is 001
The last three places in 1999 ^ 1999 are 999

Sum: 1 + 11 + 111 + 1111 + 11111

an=10^0+10^1+10^2+...10^(n-1)=(10^n-1)/9 Sn=[(10^1+10^2+10^3+...+10^n)-n]/9={[(10^(n+1)-10]/9-n}/9=[(10^(n+1)-9n-10]/81

Equations: 4x-2y = 4 2x + y = 2

It is reduced to 2x-y = 2, 2x + y = 2
The sum is 4x = 4, x = 1
Substitute x = 1 to get 4-2y = 4, y = 0
So the solution of the equations is: x = 1, y = 0

In a series circuit: what is the total voltage equal to? The expression can express why

Ohm's Law: (deformation formula: u = IR, i.e. the principle of calculating resistance by volt ampere method) ρ electric work: w = uit = Pt (applicable to all circuits) w = (generally applicable to pure resistance series circuits) w = UQ (generally applicable to pure resistance parallel circuits) electric power: P = UI =

Is 1 / a a a fraction? Is 1 / A + 1 / b a fraction?

The former is, the latter is not

The name plate of an electric kettle is marked with the word "220V 1000W". When it works normally, what is the current

From P = UI, it is concluded that:
I=P/U=1000W/220V=4.5A

The simplest common denominator of 1 / AB ^ 2, a / 2BC, 3 / 3A ^ 2C is

The least common multiple of 2,3 is 6
A maximum of 2 times
B maximum 2 times
C maximum once
So it's 6A ^ 2B ^ 2C

The resistance of an electrical appliance is 120 Ω. To make 15% of the total current in the circuit pass through the electrical appliance, it is the same as the electrical appliance Join one If the voltage at both ends of the appliance is 15% of the total voltage, it should be connected with the appliance Join one The resistance in Ω

(1) In order to make 15% of the total current in the circuit pass through the consumer, a resistor should be connected in parallel, ∵ the voltage at both ends of each branch in the parallel circuit is equal, and the main circuit current is equal to the sum of the currents of each branch, ∵ according to Ohm's law, we can get: u = I consumer r consumer = IRR = (I-I consumer) r, that is, 15I × 120 Ω = (i-15i) r, the solution is: r = 30 Ω; (2) the voltage at both ends of the consumer should be used According to Ohm's law, we can get: u consumer r consumer = URR ′ = u ′ - U consumer R ', that is, 15u ′ 120 Ω = u ′ - 15u ′ R', and the solution is: R ′ = 480 Ω

If the square + (M + 3) x + 4 of polynomial x is a complete square, then the value of M is? Fast