1 in X + 1.5 in x = 1 in 12. The answer is 20. How do you understand

1 in X + 1.5 in x = 1 in 12. The answer is 20. How do you understand

12x on both sides
12+8=x
x=20

How to calculate 1.5x-12 = x + 12

1.5x-12=x+12
1.5x-x=12+12
0.5x=24
x=48

How to calculate 1.5x-x = 75!

1.5x-x=75
(1.5-1)x=75
0.5x=75
0.5x÷0.5=75÷0.5
x=150

Solving plane equation passing through point (1,2, - 1) and y-axis

Let the plane equation be ax + by + CZ + D = 0
Because the plane equation passes through the y-axis, the point (0,0,0) is a point on the y-axis,
So the plane equation goes through point (0,0,0), point (0,1,0)
Bring the three points in
D=0
B+D=0
A+2B-C+D=0
So B = 0, a = C
So ax + AZ = 0, so x + Z = 0 is the plane equation

Subtraction of rational numbers in calculation problems
1 and 3 / 4 - 5 / 6 - 1 and 1 / 6 - (- 1 / 2)=

1 and 3 / 4 - (5 / 6 + 1 / 6) + 1 / 2 = 1 and 3 / 4 - 2 + 1 / 2 = 1 / 4

0, 1, 3, 8, 21, 55, --- what are the rules of this column?

The differences between each number and the next number are:
1,2,5,13,33
In the new sequence, the first number is equal to the second number of the original sequence
The sum of the first and second numbers of the new sequence is equal to the third number of the original sequence
The sum of the first, second and third numbers of the new sequence is equal to the fourth number of the original sequence
And so on

How to calculate 12 * 25 simply

10*25+2*25=250+50=300

There are 128 new technology books, comic books and story books bought by the library. There are 14 more science books than comic books, among which there are 76 old books and 76 old books

Science and technology books: 128-76 = 52
Comic books: 52-14 = 38
Storybooks: 76-38 = 38

How do you spell 50, 60, 70, 80, 90100?
Please answer quickly and add extra points afterwards!

50 fifty
50 sixty
70 seventy
80 eighty
90 ninety
100 a/one hundred

Add, subtract, multiply or divide by adding, subtracting, multiplying and dividing 4444. These four numbers make the result equal to 5

(4×4+4)÷4=5