Question

高一数学题第八题

高一数学题第八题讲解

Answer 1

P= { 0,1,2,3,4}
Q={ x| x=ab, a, b∈Q , a≠b}
0x1=0x2=0x3=0x4=0
1x0=1, 1x2=2, 1x3=3, 1x4=4
2x0=0, 2x1=2, 2x3=6, 2x4=8
3x0=0,3x1=3,3x2=6,3x4=12
4x0=0,4x1=4,4x2=8,4x3=12
Q = { 0, 2,3,4,6,8,12}