Question

1+{2+[3×(4+5)-6+7×8]-9}=​

Answer 1

1+{2+[3×(4+5)-6+7×8]-9}=

1+[2+(3×9-6+56)-9]=

1+[2+(27-6+56)-9]=

1+[2+(21+56)-9]=

1+(2+77-9)=

1+(79-9)=

1+70=

71