First the general score, and then compare the size of the two scores, 3 / 4 and 2 / 3, 8 / 27 and 4 / 9

First the general score, and then compare the size of the two scores, 3 / 4 and 2 / 3, 8 / 27 and 4 / 9

The least common denominator of 3 / 4 and 2 / 3 is 12
3/4=3×3/4×3=9/12
2/3=2×4/3×4=8/12
9/12>8/12
3 / 4 > 2 / 3
The least common denominator of 8 out of 27 and 4 out of 9 is 27
8/27
4/9=4×3/9×3=12/27
8/27

First share and then compare
5 out of 12 and 4 out of 9 () 0 () 7 out of 18 () 0 () 3 out of 12 () 0 () 6 out of 7 and 7 out of 8 () 0 ()
5 out of 7 and 45 out of 63 () 0 () 8 out of 27 () 0 () 4 out of 9 () 0 () 5 out of 9 and 9 out of 16 () 0 ()

15 out of 36 < 16 out of 36
14 out of 36 > 9 out of 36
48 out of 56 < 49 out of 56
45 out of 63 = 45 out of 63
8 out of 27 < 12 out of 27
80 out of 144 ＞ 54 out of 144

Solving equation 52% x + 18% = 140

Multiply both sides of the equation by 100:
52x+18=14000
52x=13982
X = 268 (not enough)

Use 15.42 decimeter iron wire to form a semicircle. What is the diameter and perimeter of the semicircle
Determinant

2×3.14r÷2+2r=15.42
3.14r+2r=15.42
r=15.42÷5.14
r=3

Simple calculation of 7.2 * 9.9/0.25

7.2*9.9/0.25
=7.2*(10-0.1)/0.25
=(72-0.72)/0.25
=285.12

Given the position of real numbers a, B, C on the number axis, as shown in the figure, the result of simplifying the absolute value of a + B - the absolute value of C-B is?
Graph information: A is less than 0, C is less than 0, a is greater than C, B is greater than 0, the absolute value of C is equal to B

c

Given a, B ∈ R, if M = A2 + B2 + 1, n = a + B + AB, then the size relation of M and N is
You'd better use the basic inequality,,,, a + B ≥ 2Ab

2M-2N=2(a^2+b^2+1)-2(a+b+ab)
=(a-1)^2+(b-1)^2+(a-b)^2
>=0
So m > = n takes the equal sign if and only if a = b = 1

It is proved that the heights of the two waists of an isosceles triangle are equal

ZM: as shown in the figure, in △ BDC and △ CEB, ∵ ∠ DBC = ∠ ECB, ∵ BDC = ∠ CEB = 90 °, BC = BC, ≌ BDC ≌ CEB, CD = be

If f (x ^ 5) = lgx, then f (2) is equal to_____

Let x ^ 5 = 2
Then x = 2 ^ (1 / 5)
So f (2)
=lg2^(1/5)
=(lg2)/5

A room is 8 meters long, 6 meters wide and 2.5 meters high. If wallpaper is pasted on the walls around the room, excluding the area of doors and windows of 10 square meters, how many square meters of wallpaper do you need? 3.5 yuan per square meter of wallpaper. How much does it cost to buy these wallpaper?

60 square meters