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KUNCI JAWABAN UJIAN TENGAH SEMESTER MATEMATIKA KELAS XI

SMK NEGERI I DOLOK MASIHUL

Esai

1. COS 3300

COS (3600 c ) = COS

COS (3600

300) = COS 300

COS 3300 =1

23

2. Tg 100= !g (1"00 300)

=

!g 30

0

= 1

33

3. D#$%!&'# B(3*3)

D#!&+,& $--/#+&! $! B(* )

D !#!#$ B(3*3) /&&! /#$%!&'# = 3 /&+ , = 3. T#!#$ B !%%!&$ /# $&/&+ I

= x2+y

2

=32+32

= 9+9

= 18

= 9x2

= 3 2

!&+ =y

x =3

3 = 1

= &4 !&+ (1) = 130

J&/#* $--/#+&! $! B &/&&' ( 2 * 130)

5. D#$%!&'# A = 50* B

= 300/&+ BC = 54

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D#!&+,& C *&+7&+g 8#8# AC /&+ &+7&+g 8#8# AB

C = 1"00 ( A 9 B )

= 1"00 ( 509 300)

= 1"00 :0

= 100

M%+%+!$&+ +# AC

AC

sinB =BC

sin A

AC

sin300 =

4 cm

sin 450

AC.8#+ 50= 5.8#+ 300

AC.1

22 = 5.

1

2

AC.1

22 = 2

AC = 5 2

M%+%+!$&+ +# AB

AB

sinC =BC

sinA

A

4cm

C

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AB

sin1050 =

4 cm

sin 450

AB.8#+ 50= 5.8#+ 100

AB.1

22

= 5.1

43

AB.22 =

3

AB =

3

2

2

AB =23

2

. D#$%!&'# & = 6* = " /&+ C=

:00

D#!&+,& 4;

42 = &29 2 2&.4-8 C

= 629 "2

2.6.".4-8 :00

= 36 9 65

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= 1

23 0

=

1

23

:. S#+ :08#+ (A 9 B) = 8#+ A.4-8 B 9 4-8 A.8#+ B

8#+ ( 509 300) = 8#+ 50. 4-8 3009 4-8 50. 8#+ 300

8#+ ( 509 300) =1

22 .

1

23 9

1

22 .

1

2

8#+ ( 509 300) =1

46

91

42

8#+ ( 509 300) =1

4 ( 6 9 2 )

". C-8 :09 4-8 10

C-8 9 4-8

= 2 4-81

2 ( 9

). C-8

1

2 (

)

C-8 :09 4-8 10 = 2 4-81

2 ( 75

0

9 150

). C-81

2 ( 75

0 15

0

)

C-8 :09 4-8 10 = 2 4-81

2 (

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& ( 2 9 = 20

2

& 9 = 20 >>..%8 (1)

( 3 =

& 9 =

& ( 3

9 =

3

& 9 = >>..%8 (2)

E##+&8# %8 (1) /%+g&+ %8 (2)2 & 9 = 20

3 & 9 =

& = 1

& = 3

88!#!8#$&+ +# & $% %8 (2)

3& 9 =

3 ( 3) 9 =

< 9 =

= +