If the corresponding point of complex z = m-2i / 1 + 2I on the complex plane is in the third quadrant, then M is in the range of value

If the corresponding point of complex z = m-2i / 1 + 2I on the complex plane is in the third quadrant, then M is in the range of value

M is a real number
z=(m-2i)/(1+2i)
=[(m-4)+(-2m-2)i]/5
If the corresponding point is in the third quadrant, then M-4

The complex number x + ilgx (1) where it may be in the complex plane; (2) if it is in the fourth quadrant, find the value range of real number X
The complex number x + ilgx (1) where it may be in the complex plane; (2) if it is in the fourth quadrant, find the value range of real number X. it's due tomorrow, quick

(1) If the real part of a complex x + Yi is x and the imaginary part is lgx, then y = lgx
Then in the complex plane, the complex can only move on the curve y = lgx. X > 0 (in the positive half axis of X when the first or fourth quadrant x = 1)
(2) If it's in the fourth quadrant, then 0

Given that the complex number x2 + X-2 + (x2-3x + 2) I (x ∈ R) is a conjugate complex of complex number 4-20i, then the value of real number x is______ ．

∵ the complex number x2 + X-2 + (x2-3x + 2) I (x ∈ R) is the conjugate complex number of the complex number 4-20i, we can get x2 + X − 2 = 4x2 − 3x + 2 = 20, the solution is x = - 3, so the answer is: - 3

It is proved that the minimum positive period of F (x) = Log1 / 2 (SiNx cosx) is (2)?

f(x)=log1/2(sinx-cosx)
=Log1 / 2 (sqrt (2) sin (x-4 / Pie))
Yes
F (x + 2 faction) = Log1 / 2 (sqrt (2) sin (x + 2 faction - 4 / faction))
=Log1 / 2 (sqrt (2) sin (x-4 / Pie))
=f(x)

If y: 5 = (y + 4): 7, what is y equal to
Proportion... Steps

y :5 = (y+4):7
y×7＝5×（y＋4）
7y＝5y＋20
7y－5y＝20
2y＝20
y＝10

Xiao Gang and Xiao Hua agreed to do their homework at his home tomorrow
Please write down the cause

It didn't explain who was in the house, causing ambiguity
Xiao Gang and Xiao Hua agreed to do their homework at Xiao Hua's house tomorrow
Or: Xiaogang and Xiaohua agreed to do their homework at Xiaogang's house tomorrow

1800 is a leap year______ ．

Because 1800 △ 400 = 4 So 1800 is a normal year. So the answer is: wrong

One third equals 0.33333, so why, one third times 3 equals 1, shouldn't it be equal to 0.99999?

This is not easy to answer, can only say that infinite cycle decimal is a magic number

In a cross-country race, when Xiao Ming ran 1600 meters, Xiao Ming ran 1450 meters. After that, they ran at an average speed of a meter / second and B meter / second respectively, and after another 100 seconds, Xiao Ming ran 1450 meters
Using function drawing method to solve the problem

100B=200A
1600+300A=1450+200B
The solution is a = 1.5
B=3
Full distance = 1600 + 300A = 2050

English translation
To begin with, she spoke too quickly, and I could't understand every word!

The first sentence can be translated into "start, she said too fast, I didn't understand anything" 2. To make as the beginning of the sentence, can be interpreted as "let" means "let", so the second sentence can be translated into