题目内容
计算:
(1)(+3)-(-2);
(2)(-1)-(+2);
(3)0-(-3);
(4)1-5;
(5)(-23)-(-12);
(6)(-1.3)-2.6;
(7)
-(-
);
(8)(-
)-(-
).
(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 |
分析:分别根据有理数的减法运算法则进行计算即可得解.
解答:解:(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)
-(-
),
=
+
,
=
;
(8)(-
)-(-
),
=-
+
,
=
.
=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 |
点评:本题考查了有理数的减法运算,熟记减去一个数等于加上这个数的相反数是解题的关键.
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