Simplification ratio: 1.2: four fifths, 75 cm: four fifths, two-thirds of an hour: 70 minutes

Simplification ratio: 1.2: four fifths, 75 cm: four fifths, two-thirds of an hour: 70 minutes

3:2
15:16
4:7

Denominator elimination of linear equation with one variable
0.4x + 0.9-0.03 0.02x + 0.03 = 2 X-5
Tomorrow

(4x+9)/5-(2x+3)/3=(x-5)/2
6(4x+9)-10(2x+3)=15(x-5)
24x+54-20x-30=15x-75
11x=99
x=9

Simple calculation of 5545 / 55 * 66

5545/55*66
=5545/5*6
=1109*6
=6654

Given that the circle C: X & # 178; + Y & # 178; - 2x-2y = 0 and the shortest chord passing through the point (2,3) in the circle is ab, then the intercept of AB on the X axis is ()
A、6 B、2 C、4 D、8
Detailed process for the best graph orz

Let the center of the circle be m, then M (1,1)
The shortest chord of a circle passing through point n (2,3) is ab, which is perpendicular to Mn
K(MN)=(3-1)/(2-1)=2
∴ k(AB)=-1/2
The linear AB: Y-3 = (- 1 / 2) (X-2)
After simplification, x + 2y-8 = 0
When y = 0, x = 8
The intercept of AB on the x-axis is 8
Choose D

Observe the figure as shown in the figure with a small cube with an edge length of 1 to find the rule
As shown in Figure 1, there is a small cube, one of which can be seen, and none can be seen
As shown in Figure 2, there are 8 small cubes, of which 7 can be seen and 1 cannot be seen
As shown in Figure 3, there are 27 small cubes, of which 19 can be seen and 8 cannot be seen
In Figure 10, there are? Invisible cubes
Formula!

729

As shown in the figure, in △ ABC, the vertical bisector De of AB intersects AB at D and BC at E. if CE = 3cm, calculate the length of be

∵ - C = 90 °, ∵ BAC = 60 °, ∵ B = 90 ° - 60 ° = 30 °, ∵ De is the vertical bisector of AB, ∵ AE = be, ∵ BAE = ∵ B = 30 °, ∵ CAE = ∵ BAE, ∵ de = CE = 3cm, and ∵ B = 30 °, ∵ be = 2DE = 2 × 3 = 6cm

Reduce the following false fraction to 2 / 8 / 4 / 17 / 51 / 72 / 77 / 8 / 9 / 2 / 5 / 9 / 17 / 12 / 48 / 32 with fraction or integer
96 out of 32 79 out of 26

2 / 2 = 1,8 / 4 = 1 / 2,17 / 51 = 3,72 / 77 = 1,5 / 72,8 / 9 = 1,1 / 8,2 / 5 = 2,1 / 2,9 / 17 = 1,8 / 9,12 / 48 = 4,32 / 96 = 3,26 / 79 = 3,7 / 26

(1) Given 1 / x + 1 / x = 3, find the value of 3x-4xy + 3Y / x + 2XY + y. (2) given that x is an integer and 2 / x + 3 + 2 / 3-x + 2x + 18 / x ^ - 9 is an integer, find the sum of all the values of X that meet the conditions

（1）∵1/x+1/y=3∴(y+x)/xy=3∴x+y=3xy(3X-4XY+3y)/(X+2XY+Y)=[3(x+y)-4xy]/[(x+y)+2xy]=(9xy-4xy)/(3xy+2xy)=5/5=1（2）2/x+3+2/3-x+2x+18/x^2-9=[2(X-3)-2(X+3)+2X+18]/(X+3)(X-3)=2(X+3)/(X+3)(X-3)=2/(X-3)∴X-...

51 degrees 28 minutes 36 seconds into degrees equal to how much ah?

51 degrees 28 minutes 36 seconds = 51 degrees 28.6 minutes = 51 and 143 / 300 degrees

How is ab = radical {(1 + K ^ 2) * [(x1 + x2) ^ 2-4x1x2]} derived?
Online, but did not see too clear, please explain the popular. The best map, thank you

Let y = KX + B Y1 = kx1 + B y2 = kx2 + B
By subtracting, we get y1-y2 = K (x1-x2) and substituting it into the distance formula between two points
AB & # 178; = (x1-x2) & # 178; + (y1-y2) & # 178; = (x1-x2) & # 178; + K & # 178; (x1-x2) & # 178; = (1 + K & # 178;) (x1-x2) & # 178; = (1 + k & # 178;) (x1-x2) & # 178; = (1 + K & # 178;) [(x1 + x2) & # 178; - 4x1x2], and then the formula is obtained