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Sagot :

13) 5:4
14)12:54
15)10:1
16)3:5
17) 21:6
18)5:1
19)5:6
20)11:12
devishri1977

Answer:

Step-by-step explanation:

[tex]13) \dfrac{5}{x}=\dfrac{20}{16}[/tex]

In the numerator, 20 ÷ 4 = 5

So, x = 16 ÷ 4 = 4

5 : 4 = 20:16

14)

[tex]\dfrac{2}{9}=\dfrac{12}{x}[/tex]

In the numerator, 2*6 = 12

So, x = 9*6 = 54

2:9 = 12 : 54

15)   [tex]\dfrac{x}{1}=\dfrac{30}{3}[/tex]

In the denominator 3 ÷ 3 = 1

So,  30 ÷ 3 = 10

10 : 1 =  30 : 3

[tex]16)\dfrac{x}{5}=\dfrac{21}{35}[/tex]

In the denominator, 35 ÷ 7 = 5

x = 21 ÷ 7 = 3

3 : 5 = 21 : 35

[tex]17) \dfrac{21}{x}=\dfrac{7}{2}[/tex]

In the numerator, 7 *3 = 21

So, x = 2*3 = 6

21: 6 = 7 : 2

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