Please draw the impedance triangle of resistance, inductance and capacitor series AC circuit

Please draw the impedance triangle of resistance, inductance and capacitor series AC circuit

Resistance normal current, capacitance lead 90 degrees, inductance lag 90 degrees

Let F: X → - x ^ 2 + 2x be the mapping from real number set R to real number set R. if t does not exist for real number T ∈ R, then the value range of T is ()
A.[1,+∞)
B.(1,+∞)
C.(-∞,1)
D.(-∞,1]
And what is the original image?

The formula on the right shows that the maximum value is 1, so there is no original image for any number larger than 1

((26 / 3) + (2 / 39)) * 13 is calculated by off formula

10 / 78 is 10 / 78, that is, 3 / 26 plus 2 / 39. If you divide them into 78, then it is 10 / 78 × 13, 13 and 78. If you change 13 into 1 and 78 into 6, it is equal to 10 / 6. If you divide 6 and 10 into 3, it is equal to 5 / 3

The equation of the symmetric line x-2y + 4 = 0 about X axis

If two straight lines are symmetrical about X axis, the slopes of the two straight lines are opposite to each other. Given that the slope of the straight line is 1 / 2, the slope of the straight line is - 1 / 2. Sort out the linear equation: y = (1 / 2) (x + 4) [Note: the X coefficient in brackets must be 1]. From the above discussion, we can get the linear equation as: y = (- 1 / 2) (x + 4), that is, x + 2Y + 4 = 0

English words from 21 to 30
I have an urgent need

twenty-one
twenty-two
twenty-three
twenty-four
twenty-five
twenty-six
twenty-seven
twenty-eight
twenty-nine
thirty

On the expansion of functions into power series
Turn this formula into a power series ln (4-3x-x ^ 2) = ln (x + 4) (1-x) = ln (x + 4) + ln (1-x) = ln4 (1 + X / 4) + ln (1-x) = ln4 + ln (1 + X / 4) + ln (1-x). If we do this in the first place and expand it according to the formula of Ln (1 + x), an ln4 will appear
But if we take the derivative and then integrate, we don't have ln4
I think the first one is also right. Why is there no ln4 in the correct answer

No, you have indefinite integral!

What's 55 times 52

55 times 52 = 2860

Given the function f (x) = 1 − 22x + T (t is a constant real number). (1) if the function is defined as R, find the range of y = f (x); (2) if there is a real number t such that y = f (x) is an odd function, prove that the image of y = f (x) is below the image of G (x) = 2x + 1-1

(1) Because 2x + T ≠ 0 is constant, so t ≥ 0, (2 points) when t = 0, the range of y = f (x) is (- ∞, 1); (4 points) when t > 0, from y = 1 − 22x + T, 2x = 2 − T + Ty1 − Y > 0, so y − (1 − 2t) y − 1 ＜ 0, that is, the range of y = f (x) is (1 − 2T, 1); (6 points) (2) from y = f

① What is the difference between subtracting the quotient of 6 / 7 divided by 6 / 5 from the reciprocal of 9 / 7?
If you subtract 15% from a number and multiply it by 5 / 34, the product is 1 / 8

1、 4/63
2、 1
Let the number be a. from the meaning of the question, we can get: (A-15% a) x 5 / 34 = 1 / 8
The solution is: a = 1

X ^ 4 + ax ^ 3 + 3x ^ 2 + 5x ^ 3-7x ^ 2-bx ^ 2-6x-2 after merging similar items, excluding x ^ 3 and x ^ 2, find a + B
Urgent··

A = - 5 B = - 4 A + B = - 9 question: how to do it? Answer: x ^ 3 x ^ 2 disappears, so a + 5 = 0 a = - 5 3-7-b = 0 B = - 4