题目内容
脱式计算
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考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)先算小括号里的加法,再算括号外的.
(2)从左向右进行计算即可;
(3)从左向右进行计算即可;
(4)先算小括号里的减法,再算括号外的加法;
(5)先算小括号里的加法,再算括号外的;
(6)从左向右进行计算即可;
(7)运用加法的交换律进行简算.
(2)从左向右进行计算即可;
(3)从左向右进行计算即可;
(4)先算小括号里的减法,再算括号外的加法;
(5)先算小括号里的加法,再算括号外的;
(6)从左向右进行计算即可;
(7)运用加法的交换律进行简算.
解答:
解:(1)
-(
+
)
=
-
=
;
(2)
-
+
=
+
=
;
(3)
+
-
=
-
=
;
(4)
+(
-
)
=
+
=
;
(5)
-
-
=
-
=
;
(6)
+
+
=
+
=
;
(7)
+
+
=
+
+
=1+
=
.
| 9 |
| 10 |
| 1 |
| 6 |
| 3 |
| 5 |
=
| 9 |
| 10 |
| 23 |
| 30 |
=
| 2 |
| 15 |
(2)
| 7 |
| 20 |
| 1 |
| 3 |
| 3 |
| 5 |
=
| 1 |
| 60 |
| 3 |
| 5 |
=
| 37 |
| 60 |
(3)
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
| 8 |
=
| 5 |
| 4 |
| 5 |
| 8 |
=
| 5 |
| 8 |
(4)
| 3 |
| 5 |
| 3 |
| 4 |
| 1 |
| 2 |
=
| 3 |
| 5 |
| 1 |
| 4 |
=
| 17 |
| 20 |
(5)
| 3 |
| 4 |
| 1 |
| 5 |
| 3 |
| 8 |
=
| 11 |
| 20 |
| 3 |
| 8 |
=
| 7 |
| 40 |
(6)
| 11 |
| 18 |
| 2 |
| 15 |
| 3 |
| 5 |
=
| 67 |
| 90 |
| 3 |
| 5 |
=
| 121 |
| 90 |
(7)
| 17 |
| 40 |
| 5 |
| 9 |
| 23 |
| 40 |
=
| 17 |
| 40 |
| 23 |
| 40 |
| 5 |
| 9 |
=1+
| 5 |
| 9 |
=
| 5 |
| 9 |
点评:本题主要考查了学生对分数四则混合运算顺序的掌握情况.
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