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10-9+8*{[7-(6+5-4)]+3-(2+1)}

Răspuns :

10-9+8*{[7-(6+5-4)]+3-(2+1)}=
1+8*{[7-(11-4)]+3-3
1+8*[(7-7)+0]=
1+8*(0+0)=
1+8*0=
1+0=1