8/10/2019 MATHS 28 (1)

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1. ()

11

1

11

2

11

3

11

4

11

5

11

1

1

2

2

3

3

4

4

5

5

6

6

2. () 243 13 18 + 7, 377 13 29

29 18 113. () 119+ 31

17 7+ 17 + 14 17+ 14

, 17 14.

4. () (251)98 + (21)29 (106)100 +(705)35 (16)4+ 259

1 + 1 6 + 5 6 + 9 4

5. ()

2

57

57

+

2

57

57

2

57

57

+

2

57

57

+ 2 2

2

57

57

57

57

2

2

22

22

)5()7(

)57()57(

2

2

57

)57(2

2

144 2 142

6. () . 116.66 . 16.66 , 100 16.66

6 17. () ,

15

8. () .500,

.500 5

4

. 400 . 600,

(600 400) 400 1 2

9. () 15 .,

5 15 75

, 7 15 105 21 5 63

75 63 25 21

10. ()

12 2

6 4

4

3

12

1611. () , 3 4 5

, 5 4 3

,

16 8

2 1

12. ()

)(

)12(

3

1

8/10/2019 MATHS 28 (1)

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13. () 168 .

14. () 1

5()2

2

5( 1)2

,

1

2 5()2 5( 1)2

95 5(2 1)(1) 10

1015. () ,

.16. ()

100

80

100

80 120

,

100

41

120

100

80

100

41+ 200

100

82

100

80+ 80

100

2 80 4000

100

41 4000 1640

1640 200 1440

%

4000

100

80

1440

100

45%17. () 10

20 100

92

5

92

23 40 100

90

828

828 92

5 60

10

72

1

18. () ,

0

100

100

19. () 100 100 25%. ,

25.1100

100

.80

80. 100 80%

20. () . 100

100 100

90 . 90

,

90 + 90 100

20 (100 + )

8%21. () . 100

. 100 + 32 . 132

132 88

100 . 150

150 100

20 . 30

100

10030150 100

20%22. () 12

9 .. : .. 3 : 4

10 5

. 300 . 400

.100

10

5100 . 50

. 450

300

400 100

3

100%

450

50 100

9

100%

3

100 3

100 9

200

22.22%

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8/10/2019 MATHS 28 (1)

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34. () ,

=1

2

=2

1

9

9=

2

1

18 2= 9 + = 3 /

= 3 /

35. () 20% ..5

2000

= 400 , 250 ,

, = 400 250= 150

36. () ,

=10

175/

=10

175

5

18/

= (63 9) /= 54 /

37. () = 2 30 = 60

= 60 20

= 40

=2

40

= 20 /38. ()

3 : 10 = 302

11

= 330102

11

= 35,

2 35 =2

11 30 3

=11

320

3 : 2911

1.

39. () , = 100 = 50

= 2

115

= .57.5

= .115

=5

4 115 = 92!

40. () = 5 = 4

,5 4 = 180

= 3

= 5+ 4= 9 3 = 27

41. ()

= =7

22 2.5

3

14=

3

1102

=3

110

25.1

1=

3

88

=3

88 33 = 968

42.() = 15 +15 = 30 = 15,= 15

= 2( + + )= 230 15 + 15 15 +

30 15= 2(450 + 225 + 450)= 2250 2

43. ()

= 23

4

16 3 =3

42 = 8

=3

82 = 4 3

=2

3 4 3=

8

3

= 8

38

3

=64

3 =

121

3 2

8/10/2019 MATHS 28 (1)

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44. () 121 2

1214

44 , 44

4

)2( 2

224

74444

154 2

45. ()

4 400 2

100 2

,2

1 100

210

220

2

220

20 400 2

46. () 2

28 14 2

360

60

7

22 14 14

2

3082

1023

22

4

3 14 14

349 2

349

3

2102 2

47. () 85, 17 51 17

171717

511785

15 15 62

15 6 17 17 26010 2

48. () .

, 3

64 4

34

49. () 28. 32 28. 32 ( + ) (28 + 32) 60

2

1

50. () , ,

, 2+ 2 2

2

+

2

2

2+ 2 2

222

51. () 2 2

7

22 7062 52

2420 2

52. () (+ 2) 2+ + 2+ +

, (+ 2) (2+ + ) (2+ + )

1(2) (2)2 2+ 0

4 2 ... ()

2(2) (2)2 2+ 0

4 2 ... () () ()2 2 2+ 2 +

53. () ,

54. () 10. 50. 70

4

14 10.(60 10)(60 + 10)

41 (3 10)

8

1

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. ()))((

))((

))((

. () 1

1

1

+

1 1

1

+

1

1

+

1

1

. ()+ +

1(+ + ) (++ )

1 ()

1+

1+

1 1

+ +

.()

1 1,

1+

1+

1

1

1

+

1

+

1

11

. ()

1

1

1( + )

1( )(+ )

. () +

+

+ 0

+ 0

. () +

1

, + 1 0

1

+

1

+

+ 1

1

(

+ 1) + (

+ 1) 0 + 0 0

0. ()+ + 1

+

1

1

+

1

0

1

+

1

0

1 0

1 0

+1 +1

+ (+1)+ (+1)

1. ()

+

1

+ + 0

+ (+ )(+ )

0

. ()

1 )1()(

1

1

. () 1.

1

1

+ +

8/10/2019 MATHS 28 (1)

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74. () (3, 8), (4, 2) (5, 1)

,

22 )28()43( , 22 )21()45(

22 )81()35(

85, 90 85

2

1 224

4

190 90854

4

125090

4

1 150

37.5 . 75. ()

180 ,

(180 ) 132 156

180 156 24

,

24

360 15

76. ()

, 45

8 ,

22

22 801 6

() 8 + 6 14

14 8 112 2

77. () ,

2

)1(

2 42 5 5

578. ()

., 2

106 + +

2 126 + 146 34

90 56

4

1 56 90

1260 2

79. ()

55

55

1

5

2 5

2 5

5 1

5 1

6

4

3

2

5 9

5 4

20 + 4 45 9 25 13

25

1380. ()

, + + 180

2 + + 180 45

2

1 24

22

248

44

)22(2

:

)22(2 : 22

1:)12( 81. ()

1

3

1

9

2

3

2 ,

360

606060 2 1