Question

[(38 xa + 120): 25 x 54] - 980 = 100
rezolvati​

Answer 1

Răspuns:

a = 10.

Explicație pas cu pas:

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

(38a + 120) : 25 = 1080 : 54

(38a + 120) : 25 = 20

38a + 120 = 25 x 20

38a + 120 = 500

38a = 380

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=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

verificare

[(38×10+120)÷25×54]-980=100

[(380+120)÷25×54]-980=100

(500÷25×54)-980=100

(20×54)-980=100

1080-980=100