Question

Fla valoarea lui a din exercițiul dat. România urgent dau coroniță

Answer 1

[(15×6-10×3×a)×4+15×4]×10=30×100
[( 90-30a) ×4+ 60 ] ×10= 3000
(360-120a+60) ×10= 3 000
(420-120a)×10= 3000
4200-1200a= 3000
3000-4200= -1200 a
-1200= -1200 a
a= -1200: - 1200
a= 1

Answer 2

[(90-30a)×4+60]×10=3000
(90-30a)×4+60=300
(90-30a)×4=240
90-30a=60
30a=30
a=1