2. Quadratic quaternions-1, -7, -6

3 、( 10+t)℃

4. There are no charts

5. There is no map

6、2× 10-6

4.082× 10-6

0.9× 10-4

0.00004(4× 10-5)

3.333× 10-9

1× 10-6

7. I don't understand