Question

1 000-[5+2×(100+y×4)-124÷4]=754

Answer 1

1000-[5+2X(100+4Y)-31]=754
1000-[5+200+8y-31]=754
1000-[174+8y]=754
174+8y=1000-754
174+8y=246
8y=72
y=9

Answer 2

1000-[5+2×(100+y×4)-124:4]=754
Este un ex. de scadere in care scazatorul este continutul parntezei patrate.  ⇒ 
5+2×(100+y×4)-124:4=1000-754
5+2×(100+y×4)-31=246  |+31     Metoda mersului invers
5+2×(100+y×4)=277   |-5
2×(100+y×4)=272  |:2
100+y×4=136  |-100
y×4=36  |:4
y=9