题目内容
准确计算:
|
| (
| ||||||||||||||||||||||
| 2-
|
|
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)先算乘法,再算加法;
(2)先算小括号里的除法,再算括号外的乘法,最后算减法;
(3)先算小括号里的减法,再算括号外的乘法,最后算除法;
(4)先算乘法,再运用加法的结合律进行简算;
(5)先算除法,再运用减法的性质进行简算;
(6)先算除法,再从左向右进行计算.
(2)先算小括号里的除法,再算括号外的乘法,最后算减法;
(3)先算小括号里的减法,再算括号外的乘法,最后算除法;
(4)先算乘法,再运用加法的结合律进行简算;
(5)先算除法,再运用减法的性质进行简算;
(6)先算除法,再从左向右进行计算.
解答:
解:(1)
+
×
=
+
=
;
(2)
-
×(
÷
)
=
-
×
=
-
=
;
(3)(
-
)×
÷
=
×
÷
=
÷
=1;
(4)
+
×
+
=
+
+
=
+(
+
)
=
+
=1;
(5)2-
÷
-
=2-
-
=2-(
+
)
=2-2
=0;
(6)
-
+
÷
=
-
+
=
+
=
.
| 5 |
| 6 |
| 5 |
| 3 |
| 4 |
| 5 |
=
| 5 |
| 6 |
| 4 |
| 3 |
=
| 13 |
| 6 |
(2)
| 5 |
| 8 |
| 1 |
| 4 |
| 8 |
| 9 |
| 2 |
| 3 |
=
| 5 |
| 8 |
| 1 |
| 4 |
| 4 |
| 3 |
=
| 5 |
| 8 |
| 1 |
| 3 |
=
| 7 |
| 24 |
(3)(
| 1 |
| 2 |
| 1 |
| 6 |
| 3 |
| 5 |
| 1 |
| 5 |
=
| 1 |
| 3 |
| 3 |
| 5 |
| 1 |
| 5 |
=
| 1 |
| 5 |
| 1 |
| 5 |
=1;
(4)
| 2 |
| 5 |
| 1 |
| 2 |
| 3 |
| 5 |
| 3 |
| 10 |
=
| 2 |
| 5 |
| 3 |
| 10 |
| 3 |
| 10 |
=
| 2 |
| 5 |
| 3 |
| 10 |
| 3 |
| 10 |
=
| 2 |
| 5 |
| 3 |
| 5 |
=1;
(5)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=2-(
| 4 |
| 3 |
| 2 |
| 3 |
=2-2
=0;
(6)
| 11 |
| 12 |
| 1 |
| 4 |
| 3 |
| 10 |
| 3 |
| 5 |
=
| 11 |
| 12 |
| 1 |
| 4 |
| 1 |
| 2 |
=
| 2 |
| 3 |
| 1 |
| 2 |
=
| 7 |
| 6 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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