Question

pune paranteze pentru a obtine rezulttele ex 3x1+2X4+1=30
3x1+2X4+1=28
3x1+2X4+1=37

3x1+2X4+1=21

Answer 1

3×(1+2×4+1)=3×(1+8+1)=3×(9+1)=3×10=30

3×(1+2×4)+1=3×(1+8)+1=3×9+1=27+1=28

3×(1+2)×4+1=3×3×4+1=9×4=36+1=37

 (3×1+2)×4+1=(3+2)×4+1=5×4+1=20+1=21