= 1+(2+8)+(4+16)
= 1+10+20 = 40
tick
1+2+4+8+`16
=1+(2+8)+(4+16)
=1+10+20
=31
1+2+4+8+16
=1+2+8+4+16
=1+10+20
=31
Tick đi tui tick lại cho
1+2+4+8+16
=1+(2+8)+(4+16)
=1+10+20
=1+30
=31
1+2+4+8+16=(2+8)+(4+16)+1=10+20+1=31
1+2+4+8+16
=(2+8)+(4+16)+1
= 10 + 20 +1
=31