It is known that the resistance of the electric iron r = 1930 Ω, which is connected to the sinusoidal AC circuit of u = 220 V to calculate the current I flowing and the power P consumed

It is known that the resistance of the electric iron r = 1930 Ω, which is connected to the sinusoidal AC circuit of u = 220 V to calculate the current I flowing and the power P consumed

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When drawing the AC path of the amplifier circuit, the coupling capacitor is often regarded as a short circuit, and the DC power supply is also regarded as a short circuit

It can't be said that the processing method is correct or incorrect. It can only be regarded as analyzing your circuit. The capacitor is isolated from direct current and alternating current, while the inductor is isolated from direct current and alternating current

How to calculate 48 / 35 * 13 / 19 + 22 / 35 * 13 / 19 simply?

=(48/35+22/35)*13/19
=2*13/19
=26/19

The diameter of a semicircle is 6cm, and its area is______ Square centimeter, perimeter is______ Cm

Semicircle area: 3.14 × (62) 2 △ 2, = 3.14 × 9 △ 2, = 28.26 △ 2, = 14.13 (square centimeter); semicircle perimeter: 3.14 × 6 △ 2 + 6, = 18.84 △ 2 + 6, = 9.42 + 6, = 15.42 (centimeter); answer: semicircle area is 14.13 square centimeter; semicircle perimeter is 15.42 centimeter

Simple calculation 88.8 * 1.2 + 2.22 * 52

88.8*1.2+2.22*52
=2.22*48+2.22*52
=2.22*（48+52）
=2.22*100
=222

As shown in the figure, in △ ABC, ab = AC, CD bisects ∠ ACB intersects at point D, AE ‖ DC intersects the extension line of BC at point E, and ∠ e = 36 ° is known to calculate the degree of ∠ B

∵ AE ‖ DC, ∵ BCD = ∠ e = 36 ° and ∵ CD bisection ∠ ACB, ∵ ACB = 2 ∠ BCD = 72 °, ∵ AB = AC, ∵ B = ∠ ACD = 72 °. A: the degree of ∠ B is 72 °

How to deduce the mathematical formula a3-b3 = (a + b) (A2 + AB + B2), and there are similar cubic formulas,

The area of trapezoid is 72 square decimeters, which is composed of three equilateral triangles
first aid

Because there are three equilateral triangles, the height of the trapezoid is the height of the equilateral triangle
The area of an equilateral triangle is 24, so let one side of an equilateral triangle be X
Because each angle of an equilateral triangle is 60 degrees, then the height of the triangle is [(radical 3) / 2] X
Therefore, the equation is {x * [(radical 3) / 2] x} / 2 = 24
Get x

If the domain of function f (x-1) is [0,2], what is the domain of function f (lgx)?
Here, the domain [0,2] refers to X or X-1, when it refers to X-1 and when it refers to X

Here, the domain [0,2] refers to X
All domains refer to the value range of X
According to the domain [0,2], we can deduce - 1 ≤ X-1 ≤ 1
That is - 1 ≤ lgx ≤ 1
Therefore, the domain of F (lgx) is [0.1,10]

A snail, climbing a tree with a height of 9m, rises 1m in the daytime and declines 2m by 3 / 3 in the night. It starts to climb up in the morning of morden day. How many days later can it reach the top of the tree?

9 (1-2 / 3) = 27 days