Răspuns:
1. 100÷10÷5×9÷6+397=10÷5×9÷6+397=
=2×9÷6+397=
=18÷6+397=
=3+397=
=400
2. 29×18+97×8-81÷9=
= 522+776-9=
=1298-9=
=1289
3. 10 000-899×3-3456=
=10 000- 2697-3456=
=10 000- 6153=
=3847
