题目内容
下面各题能简便的要简便.
+
+
1-
-
-
+
-(
-
)
4 |
5 |
2 |
3 |
1 |
5 |
1-
17 |
18 |
1 |
18 |
5 |
17 |
4 |
51 |
2 |
3 |
7 |
10 |
3 |
7 |
3 |
10 |
考点:分数的加法和减法
专题:运算顺序及法则
分析:(1)根据加法交换律进行简算;
(2)根据减法的性质进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据减法的性质进行简算.
(2)根据减法的性质进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据减法的性质进行简算.
解答:
解:(1)
+
+
=
+
+
=1+
=1
;
(2)1-
-
=1-(
+
)
=1-1
=0;
(3)
-
+
=
+
=
;
(4)
-(
-
)
=
-
+
=
+
-
=1-
=
.
4 |
5 |
2 |
3 |
1 |
5 |
=
4 |
5 |
1 |
5 |
2 |
3 |
=1+
2 |
3 |
=1
2 |
3 |
(2)1-
17 |
18 |
1 |
18 |
=1-(
17 |
18 |
1 |
18 |
=1-1
=0;
(3)
5 |
17 |
4 |
51 |
2 |
3 |
=
11 |
51 |
2 |
3 |
=
15 |
17 |
(4)
7 |
10 |
3 |
7 |
3 |
10 |
=
7 |
10 |
3 |
7 |
3 |
10 |
=
7 |
10 |
3 |
10 |
3 |
7 |
=1-
3 |
7 |
=
4 |
7 |
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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