2-2.2 根式乘法

껚ꚡꪺ궼ꩫ

NOTE:

Q.결꒰믲 a× b= a b× 굮 궭ꥷ aꅂb 뎣걏ꖿ볆?

NOTE:

Q1. ꞹꚨ솿룑꒤ (1) ꥍ (2) ꪺ 떪껗ꅃ Q2. 솿룑꒤닄ꑔ썄걏맯ꪺ뛜? ꙰ꩇ걏뿹ꪺꅁ뿹Ꙣ귾료?

NOTE:

껚ꚡꪺ궼ꩫ

2

×

3 ?

=

꙰ꩇa, b 뎣걏ꖿ볆

×

=

×

a

b

a b

ꡄ 왛꧀뵭닟

6 (

× −

3)

+

( 2)( 6

3)

꓆슲ꙃꙕꚡ

(1)

(2)

(3)

꣒썄뵭닟

1

18

3

2

×

2

×

3

×

6

꙰ꩇa, b 뎣걏ꖿ볆

×

=

×

a

b

a b

2 4

a b

꓆슲ꙃꙕꚡ

(1)

(2)

(3)

꣒썄뵭닟

~ ꓀끴ꯟ

(1

+

18)(2

+

3)

2 ( 3

×

+

6)

꙰ꩇa, b 뎣걏ꖿ볆

×

=

×

a

b

a b

(1

+

6)(1

−

6)

41

껚ꚡꪺ궼ꩫ

NOTE:

Q1. 결꒰믲 a b 2 ( × ) 라떥꧳ a 2 b 2 ( ) ×( ) ? Q2. 결꒰믲 a b 2 a b ( × ) = × 둎ꕩꕈ녯꣬ a× b

=

a b× ?

껚뢹궼ꩫꪺ귬뉺

꙰ꩇ

a, b 뎣걏ꖿ볆

×

=

×

a

b

a b

₍

_a

₎

2

₌

_a

ex. 껚ꚡꪺ궼ꩫ

NOTE:

NOTE:

NOTE:

Q1. ꯼볆ꯟ_{(a b× )}n _=? Q2. ꯼볆ꯟ_an_×am _=?

꣒썄

- 껚ꚡ궼ꩫ

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ(1) (2)

꓆슲

꓆슲ꑕꙃ껚ꚡꅇ (1) (2)

3

×

7

2

15

5

×

2

×

3

×

11

6 66

꓆슲

꓆슲

꣒썄

- 껚ꚡ궼ꩫ

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ

( 2 30)

−

×

75

3 10 4 15× 60 6

꣒썄

- 껚ꚡ궼ꓨ

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ(1) 20 (2) –81 ꓆슲ꑕꙃꙕꚡꅇ (1) (2)

꓆슲ꑕꙃꙕꚡꅇ

(1)

_{(5 3)}

2

(2)

2 ( 2 5)− 3

(3 2)

3 ( 3 3)− 43

ex. 껚ꚡꪺ궼ꩫ

NOTE:

Q. 12ꥍ 30ꕩꕈ곛ꕛ듮뛜?

NOTE:

NOTE:

꣒썄

- ꓀끴ꯟ

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ ꓆슲

꓆슲

60 ( 12

×

−

30)

24 ( 3 2) − × + 6 2 4 3 − − ꓀끴ꯟ- 돦뚵 x Ꙩ뚵 ( ) ( ) a b c ab ac a b c ac bc + = + + = +

꣒썄

- ꓀끴ꯟ

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ

꓆슲

꓆슲

(1

+

3)(2

−

2)

(2+ 5)(− 3 1)− 2 2 3 5 15 − − − − ꓀끴ꯟ– ꣢뚵 x ꣢뚵 (a b c d)( ) ac ad bc bd + + = + + +

꣒썄

- ꞹꗾꖭꓨ꒽ꚡ

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ(1) (2)

꓆슲

꓆슲ꑕꙃꙕꚡꅇ (1) (2) 2

( 5 3)

+

2 ( 2− 3) _{( 3− + 2)}2 13 6 2− 1 2 6 − − ꥍꪺꖭꓨ꒽ꚡ 2 2 2 (a b+ ) =a +2ab b+

ex. 껚ꚡꪺ궼ꩫ

NOTE:

Q. 7− 5ꥍ 5− 7곛떥뛜?

NOTE:

Q.솿룑꒤결꒰믲라녎 1 ꑀ닕ꅂ 2− 7ꑀ닕? ꓆슲ꑕꙃꙕꚡꅇ (1) (2)

꣒썄

- ꖭꓨ깴꒽ꚡ

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ(1) 30 (2) 16

꓆슲 ( 5

+

7 )( 7

−

5)

(5 2 2 5)(5 2 2 5)− + 2 2 ( 7+ 3) ( 7− 3) ꖭꓨ깴꒽ꚡ 2 2 _{( )( )} a −b = +a b a b− ꓆슲

꣒썄

- ꗽ꓀닕ꙁ궼

뻇ꗍ뵭닟 냑ꛒ룑떪ꅇ

꓆슲 (1

+

2

−

7 )(1

−

2

+

7 )

(1− 3− 5)( 1− + 3− 5) 1 2 3+ ꖭꓨ깴꒽ꚡ 2 2 _{( )( )} a −b = +a b a b− 45

뻇ꗍ뵭닟룑떪

껚ꚡꪺ궼ꩫ

#1ꅇ

₋

3 2

#2ꅇ(1) 6 (2)

₋

3 7

(3)

_{| |}

a b

2

#3ꅇ(2)

2

₊

3 6 2 3 6

₊

₊

#5ꅇ(1)

6

(2)

66

#6ꅇ

60 6

#7ꅇ(1) 20 (2)

₋

81 3

#8ꅇ

−

6 2 4 3

−

#9ꅇ

−

2 2 3

₋

₋

5

₋

15

#10ꅇ(1)

− −

1 2 6

(2)

_{− −}

13 6 2

#11ꅇ(1) 30 (2) 16

#12ꅇ

1 2 3

₊