Explicație pas cu pas:
1. [(a+390:3)×2+5]×6=1614
[(a+390:3)×2+5]=1614: 6
(a+390:3)×2+5=269
(a+390:3)×2= 269 -5
(a+390:3)×2= 264
(a+390:3)= 264:2
a+390:3= 132
a+390= 132x3
a+390= 396
a=396 -390
a = 6
2). [(a+18)×6-32]:4+2]÷5=177
[(a+18)×6-32]:4+2=177x5
[(a+18)×6-32]:4+2=885
[(a+18)×6-32]:4= 885 - 2
[(a+18)×6-32]:4= 883
(a+18)×6-32= 883×4
(a+18)×6-32= 3532
(a+18)×6= 3532+32
(a+18)×6= 3564
a+18= 3564:6
a +18= 594
a= 594 -18
a = 576
