(1)23-(-6的绝对值)-(+23)
=23-6-23
=23-23-6
=-6
(2)(-8)-(-3)+(-5)-(+9)
=-8+3-5-9
=-5-5-9
=-19
(3)2.4-(-5分之3)+(-3.1)+5分之4
=2.4+0.6-3.1+0.8
=3-3.1+0.8
=0.7
(4)21-{-1-(-12-3)}
=21-(-1+15)
=21-14
=7
(1)23-(-6的绝对值)-(+23)
=23-6-23
=23-23-6
=-6
(2)(-8)-(-3)+(-5)-(+9)
=-8+3-5-9
=-5-5-9
=-19
(3)2.4-(-5分之3)+(-3.1)+5分之4
=2.4+0.6-3.1+0.8
=3-3.1+0.8
=0.7
(4)21-{-1-(-12-3)}
=21-(-1+15)
=21-14
=7