7/31/2019 ch2-les6

1/7

2

1 2 3.

7/31/2019 ch2-les6

2/7

2

1.

2.

3. 1

4. 2

5. 3

6. 1 2 3

4.

()

7/31/2019 ch2-les6

3/7

2

( )

=1

_

=2

_

=3

_

1 2 3

_

7/31/2019 ch2-les6

4/7

2

1.

2.

3. 1

2

3

4.

( )

7/31/2019 ch2-les6

5/7

2

( )

=1

=2

=3

_

_

_

7/31/2019 ch2-les6

6/7

2

( )

=1

_=2

_ =3

_

7/31/2019 ch2-les6

7/7

2

=1

=2

=3