Question

Aflați x din: a) (12+x)+14=4•x-4; b) (3•x+2):4-2=3; c) [(x+3)•3+3]•3+3=102; d) 5•x:2=2525​ Dau coroană. Va rog

Answer 1

Răspuns:

Explicație pas cu pas:

12 + x + 14 = 4 x - 4

4 x - 4 = x + 26

4 x - x = 26 + 4

3 x = 30

x = 30 : 3

x = 10

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b)

( 3 x + 2 ) : 4 - 2 = 3

( 3 x + 2 ) : 4 = 3 + 2

3 x + 2 = 5 × 4

3 x + 2 = 20

3 x = 20 - 2

x = 18 : 3

x = 6

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c)

[ ( x + 3 ) × 3 + 3 ] × 3 + 3 = 102

[ ( x + 3 ) × 3 + 3 ] × 3 = 102 - 3

( x + 3 ) × 3 + 3 = 99 : 3

( x + 3 ) × 3 = 33 - 3

x + 3 = 30 : 3

x + 3 = 10

x = 10 - 3

x = 7

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d)

5 • x : 2 = 2 525

5 x = 2 525 × 2

5 x = 5 050

x = 5 050 : 5

x = 1 010