Răspuns :
[100:(10:5+56:7)+90]:100
= [100:(2+56:7)+90]:100
=[100:(2+8)+90]:100
=[100:10+90]:100
=[10+90]:100
=100:100
=1
= [100:(2+56:7)+90]:100
=[100:(2+8)+90]:100
=[100:10+90]:100
=[10+90]:100
=100:100
=1