Question

Ajuttooor!!!E urgent!!dau 50 de puncte​

Answer 1

Răspuns:

Explicație pas cu pas:

7/0,6 = (5/3)/d

⇒  7 × d = 0,6 × 5/3  → produsul mezilor = produsul extremilor

7 × d = (6/10) × 5/3

7 × d = 30/30

7 × d = 1

d = 1/7

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b)

4 intregi si 1/3 = (4 ×3+1)/3 = 13/3

0,(3) = 3/9 = 1/3

2,5 = 25/10 = 5/2

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(13/3) / (1/3 ) = (5/2)/c

=>    (13/3) × c = ( 1/3 ) × (5/2 )

13 c /3 = 5/6

c = (5/6 ) : (13/3)

c = (5/6 )× (3/13)

c = 5/26

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c)

2 intregi si 1/3 = (2×3+1)/3 = 7/3

(7/3)/x = (1/3) /4  ⇒   (1/3) x = 4 ×7/3

⇒  x = (28/3) : (1/3)

    x = (28/3) × 3

   x = 28

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d)

0,5 x/ 0,4 = 4,5 /1,2

⇒ 0,5 x · 1,2 = 0,4 · 4,5

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0,4 · 4,5 = (4/10 ) · 45/10  = 9/5

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0,6 x = 9/5

x = (9/5 ) : 6/10

x = (9/5) × 5/3

x = 3

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e)  

1,3 / 13 x = 2,(3)/0,1(6)

2,(3) = (23 -2 )/9 = 21/9 = 7/3

0,1(6) = (16-1)/90 = 15/90 = 1/6

(13/10) : 13 x = (13/10 ) × (1/13 x) = 1/10 x

2,(3) /0,1(6) = (7/3) : ( 1/6 ) = (7/3) × 6 = 14

1/10 x = 14 ⇒   x = 1/140