题目内容
脱式计算(能简便的要简算)
-(
-
)
-
+
-
+
+
+
-0.625.
| 1 |
| 2 |
| 7 |
| 8 |
| 3 |
| 5 |
| 6 |
| 7 |
| 5 |
| 6 |
| 2 |
| 3 |
| 5 |
| 9 |
| 5 |
| 11 |
| 7 |
| 11 |
| 4 |
| 9 |
| 1 |
| 2 |
| 3 |
| 8 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算小括号里面的减法,再算括号外面的减法;
(2)按照从左向右的顺序进行计算;
(3)根据加法交换律和结合律进行简算;
(4)按照从左向右的顺序进行计算.
(2)按照从左向右的顺序进行计算;
(3)根据加法交换律和结合律进行简算;
(4)按照从左向右的顺序进行计算.
解答:
解:(1)
-(
-
)
=
-
=
;
(2)
-
+
=
+
=
;
(3)
-
+
+
=(
+
)+(
-
)
=1+
=1
;
(4)
+
-0.625
=
-0.625
=0.25.
| 1 |
| 2 |
| 7 |
| 8 |
| 3 |
| 5 |
=
| 1 |
| 2 |
| 11 |
| 40 |
=
| 9 |
| 40 |
(2)
| 6 |
| 7 |
| 5 |
| 6 |
| 2 |
| 3 |
=
| 1 |
| 42 |
| 2 |
| 3 |
=
| 29 |
| 42 |
(3)
| 5 |
| 9 |
| 5 |
| 11 |
| 7 |
| 11 |
| 4 |
| 9 |
=(
| 5 |
| 9 |
| 4 |
| 9 |
| 7 |
| 11 |
| 5 |
| 11 |
=1+
| 2 |
| 11 |
=1
| 2 |
| 11 |
(4)
| 1 |
| 2 |
| 3 |
| 8 |
=
| 7 |
| 8 |
=0.25.
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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