题目内容
计算,能简算的要简算.
-
+
;
+
+
+
; 6-
-
;
-
+
.
| 3 |
| 4 |
| 1 |
| 2 |
| 5 |
| 8 |
| 7 |
| 9 |
| 3 |
| 7 |
| 5 |
| 9 |
| 4 |
| 7 |
| 3 |
| 11 |
| 8 |
| 11 |
| 5 |
| 6 |
| 7 |
| 9 |
| 1 |
| 6 |
考点:分数的加法和减法
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)根据加法交换律和结合律进行简算;
(3)根据减法的性质进行简算;
(4)根据加法交换律进行简算.
(2)根据加法交换律和结合律进行简算;
(3)根据减法的性质进行简算;
(4)根据加法交换律进行简算.
解答:
解:(1)
-
+
=
+
=
;
(2)
+
+
+
=(
+
)+(
+
)
=1
+1
=2
;
(3)6-
-
=6-(
+
)
=6-1
=5;
(4)
-
+
=
+
-
=1-
=
.
| 3 |
| 4 |
| 1 |
| 2 |
| 5 |
| 8 |
=
| 1 |
| 4 |
| 5 |
| 8 |
=
| 7 |
| 8 |
(2)
| 7 |
| 9 |
| 3 |
| 7 |
| 5 |
| 9 |
| 4 |
| 7 |
=(
| 7 |
| 9 |
| 5 |
| 9 |
| 3 |
| 7 |
| 4 |
| 7 |
=1
| 1 |
| 3 |
=2
| 1 |
| 3 |
(3)6-
| 3 |
| 11 |
| 8 |
| 11 |
=6-(
| 3 |
| 11 |
| 8 |
| 11 |
=6-1
=5;
(4)
| 5 |
| 6 |
| 7 |
| 9 |
| 1 |
| 6 |
=
| 5 |
| 6 |
| 1 |
| 6 |
| 7 |
| 9 |
=1-
| 7 |
| 9 |
=
| 2 |
| 9 |
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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