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2-1.1 平方根與根號

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ꖭꓨ껚ꅂ껚뢹

NOTE:

Q. 껚뻚ꖭꓨ껚ꪺꥷ롱ꅁ (1) ꖿ볆ꚳ둘귓ꖭꓨ껚? (2) 0 ꚳ둘귓ꖭꓨ껚? (3) 굴볆ꚳ둘귓ꖭꓨ껚?

NOTE:

Q1. 륊꣬ꯜꑪꪺ볆꙲ꅁ꙰꛳ꡄꖭ ꓨ껚? Q2. 225 = 152ꅁ결꒰믲 225 ꪺ ꖭꓨ껚 = ± 15 ?

NOTE:

Q1. 껚뢹ꕎꫭ꒰믲띎ꯤ? Q2. ꒰믲볋ꑬꪺ볆꙲뫙결ꞹꗾ ꖭꓨ볆?

ꖭꓨ껚

= 9

2

b

2

= a

b 결 a ꪺꖭꓨ껚

볆뻇ꥷ롱

ꡄꕘꑕꙃꙕ볆ꪺꖭꓨ껚 (1) 64 (2) 0 (3) -16 ꣒썄뵭닟

꣒썄뵭닟

꣒썄뵭닟

ꡄꕘꑕꙃꙕ볆ꪺꖭꓨ껚

(1) 225

(2)

25

(3) 0.04

4

껚뢹

= 2

2

2 ꪺꖭꓨ껚걏 ... ?

1.4142135623730950488 …

ꅵ껚뢹2ꅶ or ꅵ2 뙽껚뢹ꅶ

꣒썄뵭닟

3

(4)

ꖭꓨ껚ꅂ껚뢹

NOTE:

Q1. 결꒰믲 a 2 ( ) 라떥꧳a ? Q2. ꯼볆ꯟ (a × b)2 = ?

NOTE:

Q.ꖿꓨ꟎ꪺ쏤꫸걏궱뽮ꪺꖿꖭ ꓨ껚쇙걏굴ꖭꓨ껚?

꣒썄뵭닟

~ 보노껚뢹ꪺꥷ롱

ꡄꕘꑕꙃꙕꚡꪺ귈

(1)

(2)

(3)

2

( 2 3)

2

4

(3

)

3

2

( 0.15)

(

a

)

2

=

a

ꖭꓨ껚ꪺ둘꛳띎롱

a

궱뽮걏3 ꪺꖿꓨ꟎ꅁꡄ쏤꫸ ꣒썄뵭닟

궱뽮

a = 쏤꫸

2

꣒썄뵭닟

(5)

ꖭꓨ껚뭐껚뢹 - ꣒썄룑꩒

NOTE:

Q1. (굴볆)2 걏ꖿ볆쇙걏굴볆? Q2. ꖿ볆ꪺꖭꓨ껚ꚳ둘귓?

NOTE:

Q.굮ꡄꑰ볆ꪺꖭꓨ껚ꅁꕩꕈꗽ녎 ꑰ볆엜결꛳꫌?

NOTE:

Q. 13 ꚳ둘귓ꖭꓨ껚?

꣒썄

- ꖭꓨ껚ꥷ롱

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ(1) 24 (2) 0 (3) ꒣꙳Ꙣ

1764 ꪺꖭꓨ껚ꇗ?

(1) 576 ꪺꖭꓨ껚ꇗ? (2) 0 ꪺꖭꓨ껚ꇗ? (3) –36 ꪺꖭꓨ껚ꇗ? ± ꖭꓨ껚ꥷ롱 2 x =a x 뫙결 a ꪺꖭꓨ껚

꣒썄

- ꡄꖭꓨ껚

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ2.6

1.96 ꪺꖭꓨ껚ꇗ?

6.76 ꪺꖭꓨ껚ꇗ? ± ꖭꓨ껚ꥷ롱 2 x =a x 뫙결 a ꪺꖭꓨ껚

군뫢

13 ꪺꖭꓨ껚ꇗ?

군뫢(1) 11 ꪺ굴ꖭꓨ껚ꇗ? (2) 93 ꪺꖿꖭꓨ껚ꇗ? (3)

꣒썄

- 껚뢹ꥷ롱

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ(1) (2) (3) –7 껚뢹ꥷ롱 a 뫙결a ꪺꖿꖭꓨ껚 얪Ꝁꅵ껚뢹aꅶ 1193 49 ? − = 5

(6)

ꖭꓨ껚뭐껚뢹 - ꣒썄룑꩒

NOTE:

Q. 쏤꫸라꒣라걏굴볆?

NOTE:

Q1. 5 걏ꥷ롱꒤ꪺ귾귓ꢤꛢ? Q2. 3x – 2 걏ꥷ롱꒤ꪺ귾귓ꢤ ꛢ?

NOTE:

Q1. 결꒰믲 a2떥꧳떴맯귈 a ꛓ꒣걏떥꧳ a ? Q2. 럭 a < 0 껉ꅁ a2=? 궱뽮결19 ꖭꓨ꒽꓀ꪺꖿꓨ꟎ꅁ쏤꫸결Ꙩꓖ꒽꓀?

꣒썄

- 껚뢹둘꛳띎롱

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ

궱뽮결

15 ꖭꓨ돦ꛬꪺꖿꓨ꟎ꅁ쏤꫸결Ꙩꓖ돦ꛬ ?

19

꣒썄

- ꑷꪾꖭꓨ껚ꡄꖼꪾ볆

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ4–4 걏 5x – 4 ꪺ굴ꖭꓨ껚ꅁꡄ xꇗ?

5 걏 3x – 2 ꪺꖭꓨ껚ꅁꡄ xꇗ?

ꖭꓨ껚ꥷ롱 2 x =a x 뫙결 a ꪺꖭꓨ껚

꣒썄

- 껚뢹꧊뷨

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ5

x < 2ꅁ꓆슲

?

굙− < <3 x 2ꅁ꓆슲 2 (3x6) 껚뢹꧊뷨 2 | | a =a 2 2 (x2) + (x+3) =?

(7)

ꖭꓨ껚뭐껚뢹 - ꣒썄룑꩒

NOTE:

Q. 띑띑곝걏ꝟꚳꕴꕾꪺ낵ꩫ?

NOTE:

Q1. a걏뻣볆ꅁꕎꫭ a 걏ꯧ 볋ꪺ볆꙲? Q2. 12x걏뻣볆ꅁꕎꫭ 12x ꪺ볐럇꓀룑ꚡꚳ꒰믲꽓뱸 ꥏ?

NOTE:

Q1. 껚뢹ꚳꡓꚳꕩ꿠걏굴볆? Q2. 귾귓볆꙲뙽껚뢹떥꧳ 0?

꣒썄

- 껚뢹뭐궼ꩫ꒽ꚡ

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ(1) (2) 1

군뫢

군뫢(1) (2) 1 258 ? 256= 1 322 324 2 2 12 − × +24 13 13 17 17 18 x 결ꖿ뻣볆ꅁ뇽꣏ 결뻣볆ꪺx ꒧돌ꑰ귈결꛳ ?

꣒썄

- 껚뢹결뻣볆

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ3

a 결ꖿ뻣볆ꅁꕂ 1 < a < 60ꅁꭨ꣏녯

a

결뻣볆ꪺ

a ꙀꚳꙨꓖ귓 ?

12x 굙 ꅁꡄxꅂy ꒧귈ꅃ

꣒썄

- 껚뢹곛ꕛꇗ0

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇxꇗ4ꅁyꇗ–3

a

+ +

5

b

− =

6 0

ꅁꡄ

a

2

b

2

ꪺꖭꓨ껚ꇗ?

2 2x y+ − +5 (x+2y+2) =0 7

(8)

뻇ꗍ뵭닟룑떪

ꖭꓨ껚뭐껚뢹

#1ꅇ(1) ±8 (2) 0 (3) ꒣꙳Ꙣ

#5ꅇ

3

#6ꅇ(1) ±24 (2) 0 (3) ꒣꙳Ꙣ

#7ꅇ±2.6

#8ꅇ(1)

11

(2)

93

(3) –7

#9ꅇ

19

#10ꅇ4

#11ꅇ5

#12ꅇ(1)

17

17

18

(2) 1

#13ꅇ3

#14ꅇx = 4ꅁy = –3

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