The number of literature and art books and science and technology books purchased by the school library is three times that of science and technology books. How many literature and art books and science and technology books are there respectively? (use equation to solve)

Let the number of literature books be x and that of literature books be y
Then. There is a system of equations
1：x+y=168
2：x=3y
The solution can be obtained by calculating Y = 42 and x = 126
In addition
Let science and technology book be X
There is an equation
x+3x=168
x=42
It's the same

There are 500 literature and art books in the library, 5 / 1 more science and technology books than literature and art books. How many science and technology books are there

There are 500 + 500 * 1 / 5 = 600 science and technology books~

A 90 meters long, 66 meters wide rectangular playground, planted seedlings in the four corners and around, is the same distance between adjacent seedlings
Q: how many meters apart is the farthest? How many in all?

A rectangular playground, 90 meters long and 66 meters wide, is planted with saplings at the four corners and around to make the distance between two adjacent saplings equal. How many meters should one be planted at the farthest distance? How many saplings are needed?
It's actually the greatest common divisor of length and width
The greatest common divisor of 90 and 66 is 6, so one tree should be planted every 6 meters
The total number of saplings required is:
(90 + 66) * 2 / 6 = 52 (trees)

Fill in the brackets with the appropriate words: () like twilight

(quiet) dusk (intoxicating) dusk (short) dusk (late) dusk, etc

How to calculate X-1 / 5x = 3 / 10?

4/5X=3/10
x=3/8

The length of the classroom is 12 meters and the width is 6 meters. If you want to draw the teacher's plan (the size of the drawing is 20 cm x 30 cm), how to find the scale

The length of the drawing is 30 cm, the length of the classroom is 12 m = 120 decimeters = 1200 cm, and the scale is - 30:1200 = 1:40
A: the scale is 1:40

In the following statements, the correct one is ()
A. The degree of monomial A is 0 B and the coefficient of monomial A is 0
2. If two monomials are of the same kind, then ()
A. As long as their coefficients are the same, B, as long as they contain the same number of letters
C. As long as their times are the same, only their coefficients can be different
3. If the third power of a + 2 power y of one third x is the same as the second power of y of - 3x, then the values of a and B are ()
A、a=1,b=2 B、a=0,b= -2 C、a=2 ,b=1 D、a=1,b=1
4. Given that the value of square + 4x-2 of algebraic formula x is 3, then the value of square + 8x-5 of algebraic formula 2x is ()
A. 5 B, - 5 C, 5 or - 5 d, 0
Come on, it's only 20 minutes

1.A 2.D 3.A 4.A

Knitted fabric 60 "cloth seal 170 / m2 1 kg is equal to how many meters?

Key words: square meter weight: 170g / m2
Width: 60 "= 1.524m
Method 1
1kg / 170 = total area 5.882m2 / width 1.524 = 3.8598m
Method 2
Area of 1m length = 1x1.524 = 1524m2x g weight 0.17 = 0.259kg/m
1kg / 0.259m weight = 3.8598m
Please understand
Tips: grey knitted fabric is generally about effective width. The actual width should include the edge of grey knitted fabric. Please pay attention to the calculation!

Can you divide the following figure into four equal size figures with the same shape as the original one?
one hundred and eleven million one hundred and eleven thousand one hundred and eleven
1 1
1 111111111
1 1
1 1
eleven thousand one hundred and eleven trillion and one hundred and eleven billion one hundred and eleven million one hundred and eleven thousand one hundred and eleven
one hundred and eleven million one hundred and eleven thousand one hundred and eleven
1 1
1 1
1 111111111
1 1
1 1
eleven thousand one hundred and eleven trillion and one hundred and eleven billion one hundred and eleven million one hundred and eleven thousand one hundred and eleven

Yes

Several cubes are combined into a three-dimensional figure. Three squares are viewed from the front and three squares from the left. The square has at least several pieces
The answer seems to be 3 or 5

The number of literature and art books and science and technology books purchased by the school library is three times that of science and technology books. How many literature and art books and science and technology books are there respectively? (use equation to solve)