题目内容
计算:
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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)、(2)、(3)、(5)按照从左向右的顺序进行计算;
(4)先算小括号里面的减法,再算括号外面的减法;
(6)先算加法,再算减法;
(7)根据加法交换律和结合律进行简算;
(8)根据异分母分数的减法进行计算;
(9)根据加法交换律进行简算.
(4)先算小括号里面的减法,再算括号外面的减法;
(6)先算加法,再算减法;
(7)根据加法交换律和结合律进行简算;
(8)根据异分母分数的减法进行计算;
(9)根据加法交换律进行简算.
解答:
解:(1)
+
+
=
+
=
;
(2)
-
-
=-
-
=-
;
(3)
+
-
=
-
=
;
(4)
-(
-
)
=
-
=
;
(5)
-(
+
)
=
-
=
;
(6)
-
+
=
+
=
;
(7)
+
+
+
=(
+
)+(
+
)
=1+1
=2;
(8)
-
=
-
=
;
(9)
-1+
=
+
-1
=2-1
=1.
| 3 |
| 8 |
| 5 |
| 12 |
| 1 |
| 3 |
=
| 19 |
| 24 |
| 1 |
| 3 |
=
| 9 |
| 8 |
(2)
| 3 |
| 7 |
| 3 |
| 4 |
| 5 |
| 6 |
=-
| 9 |
| 28 |
| 5 |
| 6 |
=-
| 97 |
| 84 |
(3)
| 1 |
| 2 |
| 3 |
| 4 |
| 3 |
| 10 |
=
| 5 |
| 4 |
| 3 |
| 10 |
=
| 19 |
| 20 |
(4)
| 7 |
| 9 |
| 1 |
| 4 |
| 1 |
| 6 |
=
| 7 |
| 9 |
| 1 |
| 12 |
=
| 25 |
| 36 |
(5)
| 7 |
| 8 |
| 1 |
| 4 |
| 1 |
| 5 |
=
| 7 |
| 8 |
| 9 |
| 20 |
=
| 7 |
| 40 |
(6)
| 9 |
| 10 |
| 5 |
| 6 |
| 4 |
| 5 |
=
| 1 |
| 15 |
| 4 |
| 5 |
=
| 13 |
| 15 |
(7)
| 1 |
| 6 |
| 7 |
| 9 |
| 5 |
| 6 |
| 2 |
| 9 |
=(
| 1 |
| 6 |
| 5 |
| 6 |
| 7 |
| 9 |
| 2 |
| 9 |
=1+1
=2;
(8)
| 9 |
| 12 |
| 8 |
| 17 |
=
| 153 |
| 204 |
| 96 |
| 204 |
=
| 19 |
| 68 |
(9)
| 31 |
| 23 |
| 15 |
| 23 |
=
| 31 |
| 23 |
| 15 |
| 23 |
=2-1
=1.
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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