The least common multiple of 28 and 53 (by short division)

The least common multiple of 28 and 53 (by short division)

Because 53 is prime, its common multiple with any number is multiplied by it
28x53=1484
The first answer is right and the comment is wrong

The proportion of solution: 7: x = 4.8:9.6 16: x = 2.4:3, 3 / 4 vs. 11 / 12 = x:

7：x=4.8:9.6
7/x=1/2
x=7*2
x=14
16：x=2.4:3
2.4x=16*3
2.4x=48
x=48/2.4
x=20
3 / 4 vs 11 / 12 = x: 1 / 20
11x/12=3/4*1/20
11x/12=3/80
x=3/80*12/11
x=9/220

Given two rational numbers a and B, if AB < 0 and a + B < 0, then ()
A. A ＞ 0, B ＞ 0b. A ＜ 0, B ＞ 0C. A, B are different signs, d. A, B are different signs, and the absolute value of negative number is larger

The product of two rational numbers is negative, which means that the two numbers are different sign, and the sum is also negative, which means that the absolute value of negative number is greater than that of positive number

Granny Wang keeps some chickens and ducks. The number of chickens is three times that of ducks. There are 18 more chickens than ducks. How many chickens and ducks are there respectively

Enchanting dart girl

If f (x + 2) = 4x ^ 2 + 4x + 3 (x belongs to R), then the range of function f (x) is_____

F (x + 2) = 4x ^ 2 + 4x + 3, let t = x + 2, t belong to R, then x = T-2, f (T) = 4 (T-2) ^ 2 + 4 (T-2) + 3 = 4T ^ 2-12t + 11 = 4 (T-3 / 2) + 2, the range is [2, + ∞)

Solving the equations (1) 3x + 7-9 = 0 (2) 3x + Y / 2 + 1 = 3x-2y = 2 (3) x + 1 / 3 + Y / 2 = 1
4x=7y+5 x/2-0.25y=2
(4)2(a+1)+3(b-1)=-2
3(a+1)-2（b-1）=7/2

Your number is so strange! For example: (1) 3x + 7-9 = 0; 4x = 7Y + 5 [why "3x + 7-9 = 0" does not contain y? How does the problem come out] although it is very easy to calculate

3.7.19.55.163 what are the rules

Multiply the previous number by 3 and subtract 2, that's the following number
3×3﹣2＝7
7×3﹣2＝19
19×3﹣2＝55
55×3﹣2＝163

The volume formula of the ball is 4 / 3 π R ^ 3 (R is the radius of the ball). It is known that the volume of a copper ball is 500 cubic centimeter, and its radius (π is taken as 3)

Radius = (500 / 4) to the third power = 5cm

The new observed answers to the practical problems in mathematics of Grade 7 and the linear equations 1 and 2 with one variable
That's 74 to 77. Please, my brain is off line,

1. (1) suppose that the use of x year 430 + 3 * 100x = 3730300x = 3300x = 11 (2) method 1; 3 * 100 * 15 + 430 = 4930 (yuan) method 2; 3730 * 1 = 3730 (yuan) 2. Y = (2.3-2) x + (4500-x) * (3.5-3) y = 2250-0.2x2250-0.2 * 10000 = 1150 (yuan) 3

The natural numbers are arranged in 1 as shown in the figure. Find the number 2 of the top 10 rows and the left 13 columns. The number 127 should be arranged in the top row, the left 3 columns and the number 2000
1 2 5 10 17...
4 3 6 11 18...
9 8 7 12 19...
16 15 14 13 20...
25 24 23 22 21...
......
Urgent urgent urgent urgent urgent urgent urgent urgent writing process and answer

The first number in each row is the square of the number in the row, and then decreases. When the number is reduced to the column number of the number, the number is changed to the column number decreasing, which is almost the same meaning. So: (1) the number in the 10th row and 13th column is: 10 ^ 2-13 + 1 = 88 (2) 1