Question

AFLA VALOAREA LUI A:
A) (142 -294:7)*a=800 b)321:a*9-3=960 c)a<270:9(505-477).
VA ROGGGGGGGGGG

Answer 1

a) (142-294:7)·a=800
    (142-42)·a=800
    100·a=800⇒a=8
b) 321:a·9-3=960
    321:a·9=960-3
    321:a·9=957
    a·9=957··321
    a·9=307197⇒a=34133
c) a<270:9(505-477)
    a<30·28
    a<840⇒a∈{1,2,3,4,...,837,838,839}