2- Calcule:
3,2x106 . 5,6x10-12 =
4,5x10-8 . 1,3x10-4 =
9,4x103 . 8,3x105 =
5,3x104 ÷ 3,9x109 =
7,2x10-12 ÷ 4,8x10-8 =
2,4x10-7 ÷ 6,6x103 =
5,3x104 ÷ 3,9x109 =
8,4x10-5 ÷ 5,4x10 7 =