Question

Află valoarea lui a. [(15 x 6 - 10 x 3 x a) x 4 + 15 x 4] x 10 = 30 x 100​

Answer 1

Răspuns:

[(15 x 6 - 10 x 3 x a) x 4 + 15 x 4] x 10 = 30 x 100

[(90-30xa)X4+60]x10=3000

[(90-30 x a)X4+60]=3000:10

(90-30x a)X4+60=300

(90-30 x a)X4=300-60

(90-30 x a)X4=240

(90-30 x a)=240:4

90-30x a=60

30 x a=90-60

30 x a=30

a=30:30

a=1