Please choose any four of the five numbers - 5, - 3,2,4,6, and use the mixed operation of rational numbers to make the result 24 (each number can only be used once) very urgent! See clearly, is optional four Oh, is optional four ah, four! Can only use once!

Please choose any four of the five numbers - 5, - 3,2,4,6, and use the mixed operation of rational numbers to make the result 24 (each number can only be used once) very urgent! See clearly, is optional four Oh, is optional four ah, four! Can only use once!

(-3)*2-(-5)*6=(-6)+30=24

One half and one sixth and one twelfth and one twentieth and ninety-nine percent

In the end
Simplification = 1 + 1 / 2-1 / 2 + 1 / 3. - 1 / 99 + 1 / 99-1 / 100
=1-1/100
=99/100

Solution set of inequality x + 5 / 2 - 1 < 3x + 2 / 2

（x+5）/2 -1＜（3x+2）/2
( x+5）/2-（3x+2）/2

How to calculate the area of triangle

If the bottom a and height h of a triangle are known, then s = ah / 22. If three sides a, B and C of a triangle are known, then Helen's formula P = (a + B + C) / 2) s = √ [P (P-A) (P-B) (P-C)] = (1 / 4) √ [(a + B + C) (a + B-C) (a + C-B) (B + C-A)] 3

Is it enough to make 6 tons of concrete with 1 part of cement, 2 parts of yellow sand and 3 parts of stone at the construction site and use 10 bags of cement of the brand as shown in the figure?
Conch water 50 kg

One ton of cement is needed to make 6 tons of concrete with one part of cement, two parts of yellow sand and three parts of gravel. Ten bags of cement is 500 kg, which is not enough

The bottom diameter of a cylinder is two decimeters. The surface area is 12.56 square decimeters. What is the height of the cylinder?

Bottom area = 3.14 × (2 △ 2) &# 178; = 3.14 (square decimeter)
Bottom perimeter = 3.14 × 2 = 6.28 (decimeter)
Side area = 12.56-3.14 × 2 = 6.28 (square decimeter)
Height of cylinder = 6.28 △ 6.28 = 1 (decimeter)

A number is not only a multiple of 12, but also a factor of 16

48
Hope to adopt

Factorization:
XY (X-Y) - x (X-Y) square
-A square + 1.9b square
-12xy + x square + 36Y square
Fourth power of quarter + a square + A
A square - 8ab + 16b square
(a square + b square) square - 4A square b square
(one thirty sixth A-One third) a + 1
2 (A-1) square-12 (A-1) + 18
(xsquare - 2XY + ysquare) + (- 2x + 2Y) + 1
Known: x + y = 0.2, x + 3Y = 1, find the value of 3x square + 12xy + 12Y square
Does "^" mean square? "*" means?

XY (X-Y) - x (X-Y) square = (X-Y) [xy-x (X-Y)] = (X-Y) [2xy-x ^ 2]
=(x-y)*x(2x-y)
-A square + 1.9b square = (b radical 1.9 + a) (b radical 1.9-A)
-12xy + x square + 36Y square = (x-6y) ^ 2
Fourth power of quarter + a square + a = 1 / 4 * (4a ^ 4 + 4A ^ 2 + 1)
=1/4*(2a^2+1)^2
A square - 8ab + 16b square = (a-4b) ^ 2
(a square + b square) square - 4A square b square = (a ^ 2 + B ^ 2-2ab) * (a ^ 2 + B ^ 2 + 2Ab) = (a-b) ^ 2 (a + b) ^ 2
(36th a-third) a + 1 = 1 / 36 * (A-12) a + 1
=1/36*(a^2-12a+36)=1/36*(a-6)^2
2 (A-1) square-12 (A-1) + 18 = 2 [(A-1) ^ 2-6 (A-1) + 9]
=2[(a-1)-3]^2=2(a-4)^2
(xsquare - 2XY + ysquare) + (- 2x + 2Y) + 1 = (X-Y) ^ 2-2 (X-Y) + 1
=[(x-y)-1]^2
Known: x + y = 0.2, x + 3Y = 1, find the value of 3x square + 12xy + 12Y square
3x^2+12xy+12y^2=(x+2y)(3x+6y)=3(x+2y)^2
X + y = 0.2, x + 3Y = 1, so x + 2Y = 0.6
In this way, 3x ^ 2 + 12xy + 12Y ^ 2 = (x + 2Y) (3x + 6y) = 3 (x + 2Y) ^ 2 = 3 * 0.6 ^ 2
=3*0.36=1.08

Does the little finger, middle finger and thumb mean the same? What do they mean?

Hold your little finger: despise
Middle finger: insult
Thumbs up: praise

Simplification: (x2 + Y2) + (2y2-x2)=______ ．

The original formula = x2 + Y2 + 2y2-x2 = 3y2