Question

AJUTAȚI-MĂ VA ROOG!! E URGENT!!

Answer 1

Răspuns:

Explicație pas cu pas:

c)

100 - [ 250 - 5 × ( X - 5 ) : 5 ] × 3 = 40

[ 250 - 5 × ( X - 5 ) : 5 ] × 3 = 100 - 40

[ 250 - 5 × ( X - 5 ) : 5 ] × 3 = 60

250 - 5 × ( X - 5 ) : 5 = 60 : 3

250 - 5 × ( X - 5 ) : 5 = 20

5 × ( X - 5 ) : 5 = 250 - 20

5 × ( X - 5 ) : 5 = 230

X - 5 = 230 × 5 : 5 → aplic metoda mersului invers

X - 5 = 230

X = 230 + 5

X = 235

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b)

643 - [ ( x - 162 ) : 5 + 159 ] = 454

( x - 162 ) : 5 + 159 = 643 - 454

( x - 162 ) : 5 + 159 = 189

( x - 162 ) : 5 = 189 - 159

( x - 162 ) : 5 = 30

x - 162 = 30 × 5

x - 162 = 150

x = 150 + 162

x = 312

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c)

[ ( 3 × X + 4 ) × 2 + 5 ] × 3 + 5 = 170

[ ( 3 × X + 4 ) × 2 + 5 ] × 3 = 170 - 5

[ ( 3 × X + 4 ) × 2 + 5 ] × 3 = 165

( 3 × X + 4 ) × 2 + 5 = 165 : 3

( 3 × X + 4 ) × 2 + 5 = 55

( 3 × X + 4 ) × 2 = 55 - 5

( 3 × X + 4 ) × 2 = 50

3 × X + 4 = 50 : 2

3 × X + 4 = 25

3 × X = 25 - 4

3 × X = 21

X = 21 : 3

X = 7