How many square meters is 0.4 meters

How many square meters is 0.4 meters

You can't ask. Is 0.4 meters long or wide? The area obtained by multiplying the length by the width is square meters

How many nanometers is 25 meters

25m = 2.5 × 10 ^ 10nm
1nm = 10 ^ - 9m

-5x3 + 2x4 + 3x2 + X-1 = 0, find x (the third power of negative 5x plus the fourth power of 2x plus the square of 3x plus minus 1)

-5x³+2x^4+3x²+x-1=02x^4-2x³-3x³3x²+x-1=02x³(x-1)-3x²(x-1)+(x-1) = 0(x-1)(2x³-3x²+1) = 0(x-1)(2x³-2x²-x²+1) = 0(x-1){2x²(x-1)-(x+1)(x-1)...

There is an electric kettle marked with "220V 400W". What is the current when it works normally? What is the resistance of the heater? If it works normally for 10 hours
There is an electric kettle marked with "220V 400W". What is the current when it works normally? What is the resistance of the heater? If it works normally for 10 hours, what is the power consumption?

I = P / u = 400 / 220 = 20 / 11a r = u / I = 220 / 20 / 11 = 121 Ω P = 400 / 1000 × 10 = 4 degrees

4 (X & # 178; + y) (X & # 178; - y) - (2x & # 178; - y) ^ 2, where x = 2, y = - 3, the reduction and evaluation must be specific

=4（x²x²-y²）-4x²x²+4x²y-y²
=4x²x²-4y²-4x²x²+4x²y-y²
=4x²y-5y²
=y（4x²-5y）
Because x = 2, y = - 3
So the original formula:
= -3X（4X4+5X3）
=-93

A certain electrical appliance is connected to a 220 V power supply, and the current passing through it is 1.2 A. what is the electrical power of the electrical appliance?
2. What is the current through the furnace wire when the electric furnace with rated voltage of 220 V and rated power of 1000 W is connected to 220 V power supply

1、P＝UI＝220*1.2＝264W
2、P＝UI,I＝P/U=1000W/220V=4.55A
It must be right
From the "middle school physics navigation" answer

There is a 5-meter-long ladder, which is supported on the building. The horizontal distance between the bottom of the ladder and the ground is 3 meters, so the height of the ladder to reach the building is 3 meters______ m. If the ladder falls 1 meter vertically along the building, the distance between the bottom of the building and the bottom of the ladder on the ground is______ m．

As shown in the figure, AC = 5m, BC = 3M, so AB = ac2 − BC2 = 52 − 32 = 4cm; when the ladder slides down, ad = 1m, BD = 4-1 = 3M, de = AB = 5m, be = de2 − BD2 = 52 − 32 = 4m

How to use the watt hour meter to roughly measure the electric power consumed by an electric appliance
It's better to list a formula, such as: P =

The way upstairs is feasible, but it's too slow to wait for an hour
Turn on the electric appliance to be measured separately, and see how many turns the meter turns in a certain period of time. Assuming that the meter turns 100 turns in 10 minutes, and every 2000 turns of the meter is once, then the electric appliance uses 0.05 kwh in 10 minutes, and the electric appliance is 300W

(x-3) x2 = () 4 & # 178; X5 = () simplify the following expressions

（x-3）x2=（2x-6 ）
4²x5=（80 ）
I'm glad to answer for you. The 1900 team will answer for you
Please click the [select as satisfactory answer] button below,

If two resistors R1 = 5 ohm and R2 = 10 ohm are connected to the circuit, then I1: I2 =? U1: U2 =?

Parallel shunt, series partial pressure,
so：U1=U2 ；
I=U/R,
so I1:I2=（U1/R1)/(U2/R2)=R2:R1 .
Study hard, son