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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