What is the difference between series circuit and parallel circuit?

What is the difference between series circuit and parallel circuit?

R string = R1 + R2 + R3 +
1 / R and = 1 / R1 + 1 / r2 + 1 / R3 +

In RLC series AC circuit, r = 3 ohm, XL = 4 ohm, XC = 8 ohm, what is the circuit impedance at this time?

R = 3 Ω, XL = 4 Ω, XC = 8 Ω
Because the capacitive reactance and the inductive reactance are reversed, 8-4 = 4
3*3=9
4*4=16
9+16=25
The square root of 25 is 5, so the circuit impedance is 5 ohm

How to calculate the total impedance of RL / / C parallel circuit
There's nothing in the book about it. There's something in series, but I don't see it in parallel

How can I remember when I talked about the resonant circuit
XL=jwL,XC=1/jwC.X=XL*XC/(XL+XC)
Z=R+X
Do you write R + L / / C like that? If R and L are connected in series and then combined with C, the calculation will be complicated. If it is the latter one, find it in the section of parallel resonance quality factor

Using substitution method to solve equations: y = 3 (X-Y), x = 2 (X-Y)

y=3(x-y),x=2(x-y)
x=0
y=0

The answers to the supplementary exercises on page 59-60 of the sixth grade mathematics volume I of Jiangsu Education Press?

One third of eight 2.12 3.one half 4.20 5.36 6.one hundred two 1.16 13 2.6 3.one third of sixteen 1.14 2.6 3.one and four fifths 1.4 kg 5.2 yuan 1.7 yuan P60 page 1.1.two fifths 2.four fifths 3.five fifths

When x = - 2, the algebraic formula ax square plus BX square plus CX square plus 5 is equal to 7. When x = 2, the value of the algebraic formula is obtained

∵ when x = - 2, the algebraic expression ax squared plus BX squared plus CX squared plus 5 equals 7
∴4a+4b+4c+5=7; 4a+4b+4c=2
When x = 2,
Ax square plus BX square plus CX square plus 5 = 4A + 4B + 4C + 5 = 7

A simple calculation of 7.2 divided by 1.6 and 0.8

7.2÷（1.6+0.8）=7.2÷2.4=72÷24=3

Cut the largest triangle from a parallelogram with a base of 8 cm and a height of 5 cm, and the remaining area

Area of the remaining part = 1 / 2 × (8 × 5) = 20 (CM & # 178;)

Three eighths: x = 7:11
Is it 56 out of 33 or 33 out of 56?

3/（8X）=7/11
8X=33/7 X=33/56

A rectangular board is twice as long and 36 decimeters in circumference. How many square decimeters is the area of this board?

Let the width be x and the length be 2x
（x+2x）X2=36
x=6
S=6x6x2=72