把下列各数填入相应的数集内:
-100,+12,313,-27,0.01,68,-10%,0,18‰,-214,2.0,0.•4•5,π.
正有理数集:{};
负有理数集:{};
整数集:{};
分数集:{};
自然数集:{};
非负数集:{}.
正有理数集:{+12,313,0.01,68,18‰,2.0,0.•4•5};
负有理数集:{-100,-27,-10%,-214};
整数集:{-100,+12,68,0,2.0};
分数集:{313,-27,0.01,-10%,18‰,-214,0.•4•5};
自然数集:{+12,68,0,2.0};
非负数集:{+12,313,0.01,68,0,2.0,0.•4•5,π}.
13
有理数的定义:有理数是整数和分数的统称,一切有理数都可以化成分数的形式。