Question

1. Grupeaza convenabil factorii, pentru a calcula rapid:
2 x 3 x 5 =
7 x 2 x 5 =       
8 x 4 x 2 =     
4 x 12 x 0 = 
2 x 7 x 2 =
3 x 5 x 2 =
0 x 5 x 2 =
1 x 9 x 10 =

Answer 1

2x5x3=
2x5x7=
2x4x8=
Xx0=def.0
2x2x7=
3x2x5=
0
10x1x9=
Succes.