Question

[(38×a+120):25×54]-980=100
AFLĂ PE a!!!!!!!!!
URGENT!!!!

Answer 1

[ ( 38 × a + 120 ) : 25 × 54 ] - 980 = 100

[ ( 38 × a + 120 ) : 25 × 54 ] = 100 + 980

[ ( 38 × a + 120 ) : 25 × 54 ] = 1080

[ ( 38 × a + 120 ) : 25 ] = 1080 : 54

[ ( 38 × a + 120 ) : 25 ] = 20

[ ( 38 × a + 120 ) ] = 20 × 25

[ ( 38 × a + 120 ) ] = 500

38 × a = 500 - 120

38 × a = 380

a = 380 : 38

a = 10

Answer 2

Răspuns:

Explicație pas cu pas:

[ ( 38 × a + 120 ) : 25 × 54 ] - 980 = 100

( 38 × a + 120 ) : 25 × 54 = 100 + 980

( 38 × a + 120 ) : 25 × 54 = 1 080

38 × a + 120 = 1 080 : 54 × 25 → aplic metoda mersului invers

38 × a + 120 = 20 × 25

38 × a + 120 = 500

38 × a = 500 - 120

38 × a = 380

a = 380 : 38

a = 10 → numarul