题目内容
计算.(能用简便方法的应用简便方法)
|
|
1-
|
分析:(1)从左往右依次运算;
(2)运用加法交换律与结合律简算;
(3)运用减法的性质简算.
(2)运用加法交换律与结合律简算;
(3)运用减法的性质简算.
解答:解:(1)
-
+
=
+
=
;
(2)
+
+
=(
+
)+
=1+
=1
;
(3)1-
-
=1-(
+
)
=1-1
=0.
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 8 |
=
| 1 |
| 2 |
| 7 |
| 8 |
=
| 11 |
| 8 |
(2)
| 3 |
| 11 |
| 11 |
| 12 |
| 8 |
| 11 |
=(
| 3 |
| 11 |
| 8 |
| 11 |
| 11 |
| 12 |
=1+
| 11 |
| 12 |
=1
| 11 |
| 12 |
(3)1-
| 5 |
| 12 |
| 7 |
| 12 |
=1-(
| 5 |
| 12 |
| 7 |
| 12 |
=1-1
=0.
点评:此题考查了分数的加减混合运算,灵活运用运算定律或性质进行简算.
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