Question

18. Pune paranteze pentru a obține propoziții adevărate:
3 x 1 + 2 x 4 + 1 = 37
3 x 1 + 2 x 4 + 1 = 28
2
3 x 1 + 2 x 4 + 1 = 21
3 x 1 +2 x 4+1 = 30

Answer 1

3×[(1+2)×4]+1=

3×(3×4)+1=

3×12+1=

36+1=

37

[3x(1+2×4)]+1=

[3×(1+8)]+1=

(3×9)+1=

27+1=

28=

[(3×1+2)×4]+1=

[(3+2)×4]+1=

(5×4)+1=

20+1=

21

3×[(1+2×4)+1]=

3×[(1+8)+1]=

3×(9+1)=

3×10=

30