题目内容
下面各题用你喜欢的方法计算.
+
-
-(
-
)
+
+
-
+(
-
)
-
+
-
2
-
-
.
| 3 |
| 7 |
| 5 |
| 9 |
| 1 |
| 6 |
| 29 |
| 24 |
| 5 |
| 24 |
| 5 |
| 9 |
| 22 |
| 15 |
| 7 |
| 13 |
| 8 |
| 15 |
| 7 |
| 13 |
| 7 |
| 8 |
| 5 |
| 6 |
| 7 |
| 12 |
| 7 |
| 9 |
| 3 |
| 10 |
| 2 |
| 9 |
| 7 |
| 10 |
| 4 |
| 5 |
| 8 |
| 15 |
| 7 |
| 15 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)按照从左向右的顺序进行计算;
(2)根据减法的性质进行简算;
(3)根据加法交换律和结合律进行简算;
(4)先算减法,再算加法;
(5)根据加法交换律和结合律进行简算;
(6)根据减法的性质进行简算.
(2)根据减法的性质进行简算;
(3)根据加法交换律和结合律进行简算;
(4)先算减法,再算加法;
(5)根据加法交换律和结合律进行简算;
(6)根据减法的性质进行简算.
解答:
解:(1)
+
-
=
-
=
;
(2)
-(
-
)
=
-
+
=1+
=1
;
(3)
+
+
-
=(
+
)+(
-
)
=2+0
=2;
(4)
+(
-
)
=
+
=
;
(5)
-
+
-
=(
+
)-(
+
)
=1-1
=0;
(6)2
-
-
=2
-(
+
)
=2
-1
=1
.
| 3 |
| 7 |
| 5 |
| 9 |
| 1 |
| 6 |
=
| 62 |
| 63 |
| 1 |
| 6 |
=
| 103 |
| 126 |
(2)
| 29 |
| 24 |
| 5 |
| 24 |
| 5 |
| 9 |
=
| 29 |
| 24 |
| 5 |
| 24 |
| 5 |
| 9 |
=1+
| 5 |
| 9 |
=1
| 5 |
| 9 |
(3)
| 22 |
| 15 |
| 7 |
| 13 |
| 8 |
| 15 |
| 7 |
| 13 |
=(
| 22 |
| 15 |
| 8 |
| 15 |
| 7 |
| 13 |
| 7 |
| 13 |
=2+0
=2;
(4)
| 7 |
| 8 |
| 5 |
| 6 |
| 7 |
| 12 |
=
| 7 |
| 8 |
| 1 |
| 4 |
=
| 9 |
| 8 |
(5)
| 7 |
| 9 |
| 3 |
| 10 |
| 2 |
| 9 |
| 7 |
| 10 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 3 |
| 10 |
| 7 |
| 10 |
=1-1
=0;
(6)2
| 4 |
| 5 |
| 8 |
| 15 |
| 7 |
| 15 |
=2
| 4 |
| 5 |
| 8 |
| 15 |
| 7 |
| 15 |
=2
| 4 |
| 5 |
=1
| 4 |
| 5 |
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定律简便计算.
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