It is known that, as shown in the figure, ⊙ o is the intersection point e of the chord AB and CD, ab = CD, and the proof is AE = De

It is known that, as shown in the figure, ⊙ o is the intersection point e of the chord AB and CD, ab = CD, and the proof is AE = De

∵AB=CD
≌△ OAB and ≌△ OCD
∴∠AOB=∠COD
∴∠AOD=∠COB
∴△AOD≌△COB
∴AD=BC
Also ∵ △ AED ∽ CEB
∴AE=CE.

1. (- 5) * 3 / 13 + (- 5) * (- 2 / 13) - 5 * 1 / 13 + 0.125 * (- 14 / 13) * (- 8) = 4 / 13 for process analysis (simple algorithm)
2. (3 / 7-5 / 9 + 8 / 21) * 63-7.15 * 5 + 3.15 * 5 for process analysis and answers (simple algorithm)
1、(-5)*3/13+(-5)*(-2/13)-5*1/13+0.125*(-14/13)*(-8)=4/13
2、（3/7-5/9+8/21）*63-7.15*5+3.15*5

1.(-5)*3/13+(-5)*(-2/13)-5*1/13+0.125*(-14/13)*(-8）=-5*（3/13-2/13+1/13）+1/8*（-8）*(-14/13)=-5*2/13+14/13=-10/13+14/13=4/132.（3/7-5/9+8/21）*63-7.15*5+3.15*5=3/7*63-5/9*63+8/21*63-5*(7.15-3.15)=27...

As shown in the figure, in the triangle ABC, the angle a = 90 degrees is called BAC = 60 degrees. The intersection of the vertical bisector of AB and point D is called BC at point E. if CE = 5cm, find the value of be
long

Angle A and angle BAC are not the same angle? In the triangle ABC? I don't understand and can't answer!

Turn the following false fractions into fractions or integers 1:10 of 8 2:5 of 4 3:20 of 17 4:22 of 15

1 and 1 / 4

Given that x ^ 2-2 / x ^ 3-3x ^ 2 + 2x = A / x + B / X-1 + C / X-2, try to determine the values of integers a, B, C,

How to convert degrees, minutes and seconds into degrees in Excel

Suppose that column A is the original data column (degrees, minutes and seconds), first select column a - set cell format - user defined "°" ′ "″"; suppose that column B is the conversion column (degrees), select column B - set cell format - user defined - g / general format "°"; input initial data in column A: 134 ° 25 ′ 27

According to what formula: | x1-x2 | = root [(x1 + x2) ^ 2-4x1x2]

(x1-x2)^2=x1^2-2x1x2+x2^2=(x1+x2)^2-4x1x2
Square both sides to get:
|X1-x2 | = radical [(x1 + x2) ^ 2-4x1x2]

11 times 12 is equal to

132

Given vector a = (- 1, SiNx), vector b = (1 / 2, cosx), vector a is perpendicular to vector B, and X is an acute angle, then x=

Vector a is perpendicular to vector B
ab=0
-1*1/2+sinxcosx=0
1/2sin2x=1/2
sin2x=1
Because x is an acute angle
So x = 45

Divide 0.25 by (4 / 5 + 0.2) - 1 / 4 and calculate with a simple method

25 divided by (4 / 5 + 0.2) - 1 / 4
=1 / 4 divided by 1-1 / 4
=1/4-1/4
=0