Question

[(a+549:6)*7-100):20=30​

Answer 1

Răspuns:

[(a+91.5)×7-100):20=30

(7a+640.5-100):20=30

(7a+540.5):20=30

7a+540.5/20=30

600=7a+540.5

59.5=7a

a=59.5/7

a=8.5

Answer 2

[ ( a + 549 : 6 ) × 7 - 100 ] : 20 = 30

[ ( a + 91, 5 ) × 7 - 100 ] : 20 = 30

( a + 91, 5 ) × 7 - 100 = 30 × 20

( a + 91, 5 ) × 7 - 100 = 600

( a + 91, 5 ) × 7 = 600 + 100

( a + 91, 5 ) × 7 = 700

a + 91, 5 = 700 : 7

a + 91, 5 = 100

a = 100 - 91, 5

a = 8, 5