1. Zero is:
Minimum positive number
The smallest integer
Minimum natural number
The number with the smallest absolute quality of data.
2.A and B are rational numbers, and the positions of their corresponding points on the number axis are shown in the following figure: A, -A, B and -B are arranged in descending order:
A -b
With point d as DE¡ÍAB in e,
And DC¡ÍCB, AB¡ÍCB,
¡à¡ÏDEB=¡ÏABC=¡ÏDCB=90£¬
¡à Quadrilateral DEBC is a rectangle,
In Rt¡÷ADE, ¡Ï ¦Á = 43, DE = CB =139m.
A