题目内容
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0.5+
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|
|
分析:(1)根据减法的性质进行计算;
(2)根据减法的性质进行计算;
(3)根据加法交换律和结合律进行计算;
(4)根据减法的性质进行计算;
(5)根据加法交换律和结合律进行计算;
(6)根据加法交换律进行计算.
(2)根据减法的性质进行计算;
(3)根据加法交换律和结合律进行计算;
(4)根据减法的性质进行计算;
(5)根据加法交换律和结合律进行计算;
(6)根据加法交换律进行计算.
解答:解:
(1)
-
-
,
=
-(
+
),
=
-
,
=
;
(2)
-(
+
),
=
-
-
,
=
-
-
,
=1-
,
=
;
(3)0.5+
-0.5+
,
=(0.5-0.5)+(
+
),
=0+
,
=
;
(4)
-(
-
),
=
-
+
,
=
+
-
,
=1-
,
=
;
(5)
-
-
+
,
=(
+
)-(
+
),
=2-1,
=1;
(6)
+
-
,
=
-
+
,
=
+
,
=
.
(1)
| 7 |
| 6 |
| 3 |
| 5 |
| 1 |
| 5 |
=
| 7 |
| 6 |
| 3 |
| 5 |
| 1 |
| 5 |
=
| 7 |
| 6 |
| 4 |
| 5 |
=
| 11 |
| 30 |
(2)
| 5 |
| 4 |
| 3 |
| 7 |
| 1 |
| 4 |
=
| 5 |
| 4 |
| 3 |
| 7 |
| 1 |
| 4 |
=
| 5 |
| 4 |
| 1 |
| 4 |
| 3 |
| 7 |
=1-
| 3 |
| 7 |
=
| 4 |
| 7 |
(3)0.5+
| 1 |
| 4 |
| 1 |
| 4 |
=(0.5-0.5)+(
| 1 |
| 4 |
| 1 |
| 4 |
=0+
| 1 |
| 2 |
=
| 1 |
| 2 |
(4)
| 4 |
| 5 |
| 7 |
| 8 |
| 1 |
| 5 |
=
| 4 |
| 5 |
| 7 |
| 8 |
| 1 |
| 5 |
=
| 4 |
| 5 |
| 1 |
| 5 |
| 7 |
| 8 |
=1-
| 7 |
| 8 |
=
| 1 |
| 8 |
(5)
| 17 |
| 9 |
| 1 |
| 6 |
| 5 |
| 6 |
| 1 |
| 9 |
=(
| 17 |
| 9 |
| 1 |
| 9 |
| 1 |
| 6 |
| 5 |
| 6 |
=2-1,
=1;
(6)
| 3 |
| 7 |
| 1 |
| 4 |
| 1 |
| 14 |
=
| 3 |
| 7 |
| 1 |
| 14 |
| 1 |
| 4 |
=
| 5 |
| 14 |
| 1 |
| 4 |
=
| 17 |
| 28 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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