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DH
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H24
31 tháng 3 2022 lúc 8:22

Đúng : a + b = b + a

(a + b) + c = a + (b + c)

a - 0 = a

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HH
31 tháng 3 2022 lúc 8:22

1 2 6

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LS
31 tháng 3 2022 lúc 8:26

a, b, g

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TH
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BN
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NT
14 tháng 12 2023 lúc 19:12

a: Xét tứ giác ABOC có

\(\widehat{ABO}+\widehat{ACO}=90^0+90^0=180^0\)

=>ABOC là tứ giác nội tiếp

=>A,B,O,C cùng thuộc một đường tròn

Xét (O) có

AB,AC là các tiếp tuyến

Do đó: AB=AC

=>A nằm trên đường trung trực của BC(1)

Ta có: OB=OC

=>O nằm trên đường trung trực của BC(2)

Từ (1) và (2) suy ra OA là đường trung trực của BC

=>OA\(\perp\)BC tại H

b: Xét (O) có

ΔEDB nội tiếp

BD là đường kính

Do đó: ΔBED vuông tại E

=>BE\(\perp\)ED tại E

=>BE\(\perp\)AD tại E

Xét ΔDBA vuông tại B có BE là đường cao

nên \(AE\cdot AD=AB^2\left(3\right)\)

XétΔABO vuông tại B có BH là đường cao

nên \(AH\cdot AO=AB^2\left(4\right)\)

Từ (3) và (4) suy ra \(AE\cdot AD=AH\cdot AO\)

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H24
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TD
15 tháng 6 2022 lúc 20:31

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QA
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IK
17 tháng 4 2022 lúc 9:35

A

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QA
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NL
17 tháng 4 2022 lúc 12:33

\(\overrightarrow{BD'}=\overrightarrow{BA}+\overrightarrow{AD}+\overrightarrow{DD'}=-\overrightarrow{AB}+\overrightarrow{AD}+\overrightarrow{AA'}\)

\(=-\overrightarrow{a}+\overrightarrow{b}+\overrightarrow{c}\)

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TL
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VH
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LD
7 tháng 10 2016 lúc 14:28
Áp dụng tính chất dãy tỷ số bằng nhau, ta có:




=>   a = b = c = 2013

Vậy b = 2013; c = 2013
  
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LD
7 tháng 10 2016 lúc 14:32

Áp dụng tính chất dãy tỷ số bằng nhau, ta có:




=> a = b = c = 2003

Vậy b = 2003; c = 2003

  
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LD
7 tháng 10 2016 lúc 14:33

a, Áp dụng tính chất dãy tỷ số bằng nhau, ta có:




=> a = b = c = 2003

Vậy b = 2003; c = 2003

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PH
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