Question

Aflati termenul necunoscut x din proportiile:



Va rog repede!!!!!!!!!!!

Answer 1

a)

x / ( 5 × 3^3 : 15 - 1) = 3 / 4

x / ( 3^3 : 3 - 1) = 3 / 4

x / (3^2 - 1) = 3 / 4

x / (9 - 1) = 3 / 4

x / 8 = 3 / 4

x = 8 × 3 / 4

x = 2 × 3

x = 6
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b)

( 3 × 2^5 : 12 + 1) / x = 9 / 5

( 2^5 : 4 + 1) / x = 9 / 5

( 2^5 : 2^2 + 1) / x = 9 / 5

( 2^3 + 1) / x = 9 / 5

( 8 + 1 ) / x = 9 / 5

9 / x = 9 / 5

x = 9 × 5 / 9

x = 5
______



c)

3 / 7 = x / ( 2 × 5^3 : 10 - 4)

3 / 7 = x / ( 5^3 : 5 - 4)

3 / 7 = x / ( 5^2 - 4)

3 / 7 = x / ( 25 - 4)

3 / 7 = x / 21

x = 3 × 21 / 7

x = 3 × 3

x = 9
_____