题目内容
计算:
(1)(-4
)-[(-4
)-(-3
)];
(2)
+(-2
)-(-1
)-(+0.5).
(1)(-4
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
(2)
| 5 |
| 6 |
| 1 |
| 2 |
| 1 |
| 6 |
分析:(1)根据有理数的减法运算法则去掉括号,然后进行计算即可得解;
(2)根据有理数的减法运算法则与加法运算法则进行计算即可得解.
(2)根据有理数的减法运算法则与加法运算法则进行计算即可得解.
解答:解:(1)(-4
)-[(-4
)-(-3
)];
=-4
+4
-3
,
=-3
;
(2)
+(-2
)-(-1
)-(+0.5),
=
-2
+1
-
,
=
+1
-2
-
,
=2-3,
=-1.
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
=-4
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
=-3
| 2 |
| 3 |
(2)
| 5 |
| 6 |
| 1 |
| 2 |
| 1 |
| 6 |
=
| 5 |
| 6 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 2 |
=
| 5 |
| 6 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| 2 |
=2-3,
=-1.
点评:本题考查了有理数的减法运算,熟记运算法则是解题的关键.
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