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)
2
3
-(-
1
2
);
(8)(-
1
6
)-(-
1
2
).
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

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