อัตราส่วนและร้อยละ

34
แแแแแแแแแแแแแแแแ 1 แแแแแแแแแ แ.2 แแแแแแ แแแแแแแแแแแแแแแแแแแ ------------------------------------------- ------- ------------------------------------------- ----------------- ----- 1. แแแแแแแแแแแแแแแแแแแแ x แแแแแแแแแแแแแ 1.1. 9 + x : 7 + x = 5 : 4 ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. 1.2. : = 1 : 5 ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. 2. แแแแแแแแแแแแแแแแแแแแแแแแแแแ แแแ แแแแ 2 : 3 แแแแแแ 7 แแแแแแแ แแแแแแแแ แแแแแแแแแแแแแแแแแแแแแแแแแแแแแแ แแแแ 3 : 4 แแแแแแแแแแแแแแแแแแแ แแแแแแแแแแแแ

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1

1

.2

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1.1.9 + x : 7 + x = 5 : 4

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1.2. : = 1 : 5

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2. 2 : 3 7 3 : 4

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3

.2

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12 120,000

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1.2. 48,000 ...................................................................................................................................................

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...................................................................................................................................................2. 40,000 2 20,000 4 40,000 100,000

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2.2. 6

100,000

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...................................................................................................................................................3. 20 % 100

24,600 1

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................................................................................................................................................... 4 .2 -------------------------------------------------- ------------------------------------------------------------ -----1. 18,000 15,000

16,000

60,000

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...................................................................................................................................................2. 160 125

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...................................................................................................................................................3. 1

2 8 1

2 5 : 7

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2

.2 -------------------------------------------------- ------------------------------------------------------------ -----1. x : y

1.1. 4(2x - y) = 3(2y + x)

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2. x : y = 4 : 7 2x + 5y : 3y - 2x

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3. a : b = 10 : 3 2a - 5b : a - 3b

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5

.2

-------------------------------------------------- ------------------------------------------------------------ -----1. 8,540 10 % 12% 1

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2. 3 : 2 30% 30%

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3. 400 20%

25% 5%

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......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................4. 610 125%

80%

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........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6

.2

-------------------------------------------------- ------------------------------------------------------------ -----1.A B 30% B C 30% A C

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...2. 60 15% 10%

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..3. 21% 15%

19% 60 15%

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.2 -------------------------------------------------- ------------------------------------------------------------ -----1.

1. 35 28

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2. 48 30

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3. 54 45

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1. 1.5 42

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2. 0.6 45

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1. 2.5 1 : 500,000

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2. 450 1 : 500,000

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3. 245

..4. 12 25 8

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8 21

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6.

1.35C

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2.- 42C

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3.252F

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4.- 212F

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7. 18 926 14

879 14

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................................................................................................................................................... 1

.2 -------------------------------------------------- ------------------------------------------------------------ 1. x

1.1.9 + x : 7 + x = 5 : 4

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1.2. : = 1 : 5

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2. 2 : 3 7 3 : 4

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