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efectuați 1+{2+[3×(4+5)-6×7-8]-9}

Răspuns :

1+{2+[3×(4+5)-6×7-8]-9}=
1+[2+(3×9-6×7-8)-9]=
1+[2+(27-42-8)-9]=
1+[2+(- 15-8)-9]=
1+(2-23-9)=
1+(-21-9)=
1-30=
- 29
 1+{2+[3×(4+5)-6×7-8]-9}=
=1+[2+(3x9-42-8)-9]=
=1+[2+(27-42-8)-9]=
=1+(2+(-23)-9)=
=1+(-21-9)=
=1-30=
=-29