问题
解答题
计算: (1)(+3)-(-2); (2)(-1)-(+2); (3)0-(-3); (4)1-5; (5)(-23)-(-12); (6)(-1.3)-2.6; (7)
(8)(-
|
答案
(1)(+3)-(-2),
=3+2,
=5;
(2)(-1)-(+2),
=-1-2,
=-3;
(3)0-(-3),
=0+3,
=3;
(4)1-5=-4;
(5)(-23)-(-12),
=-23+12,
=-11;
(6)(-1.3)-2.6,
=-1.3-2.6,
=-3.9;
(7)
-(-2 3
),1 2
=
+2 3
,1 2
=
;7 6
(8)(-
)-(-1 6
),1 2
=-
+1 6
,1 2
=
.1 3