Question

我们规定一种运算#,对于任意的有理数a,b,

Answer 1

解析

（1）1#2=1-2-1

=-1-1

=-2

(2)2#1

=2-1-1

=1-1

=0

(3）2#3=2-3-1

=-2

1#-2

=1+2-1

=2