The number of girls in class 61 accounts for three fifths of the class. It is known that there are 11 more girls than boys. How many students are there in class 61

The number of girls in class 61 accounts for three fifths of the class. It is known that there are 11 more girls than boys. How many students are there in class 61

The proportion of boys in the class = 1-3 / 5 = 2 / 5
The total number of students in class 61 = 11 (3 / 5-2 / 5) = 55

In the sixth grade, the number of boys in a class accounts for 5% of the total number of the class. What percentage of the boys are girls?
The formula will be handed in the day after tomorrow
Is that right

If there are 90 people, there are 50 boys and 40 girls. The proportion of girls in boys is 40 / 50 = 0.8.80%

If a square matrix of order n is invertible, then a * power is invertible, and the inverse of a * power is

A/detA

If | Z-1 | = 1, try to explain the locus of the point corresponding to the complex Z

Is a circle with (1,0) as the center and 1 as the radius

Class 1 of Grade 8 should take a group photo when they go out on holiday. If a color negative costs 0.57 yuan, a developing one costs 0.35 yuan, and each person should book one, and the cost is not more than 0.45 yuan, then there are at least () students taking the group photo?
A. 5B. 6C. 7D. 8

According to the meaning of the question, we can get: 0.57 + 0.35x ≤ 0.45X, the solution is: X ≥ 5.7, at least 6 students take the group photo

If f '(x) = - 3, then f (x + H) - f (x-3h) / h =?
Hurry! Step!

[f(x+h)-f(x-3h)]/4h*4
The original formula is 4 * Lim [f (x + H) - f (x-3h)] / 4H
Because H - > 0
Therefore, we define [f (x + H) - f (x-3h)] / 4H = f '(x) by derivative
Original formula = 4 * f '(x) = 4 * - 3 = - 12

25 (x-2y) cubic + 4 (2y-x)

You mean factorization?
First, extract the common factor x-2y, and get [25 times the square of (x-2y) - 4] times (x-2y), (note the sign)
Then in the brackets, according to the inverse formula of square difference, we get [5 (x-2y) + 2] [5 (x-2y) - 2] (x-2y)
The final result is (5x-10y + 2) times (5x-10y-2) times (x-2y)

What color is your dress, please

What color is your clothes?

How many thousands of square kilometers is one mu
fast

One mu is 666.67 square meters, one square kilometer = 1500 mu
How much is one mu equal to 0.000000066667 million square kilometers

X is equal to the Y power of E, how much is y, and E is the natural logarithm

Logarithm
y=lnx