题目内容
(
+
)-(
-
)=(
-
)-(
-
)
| 13 |
| 11 |
| 7 |
| 9 |
| 13 |
| 11 |
| 7 |
| 9 |
| 13 |
| 11 |
| 13 |
| 11 |
| 7 |
| 9 |
| 7 |
| 9 |
×
×
.分析:根据分数四则混合运算的顺序,先去括号再进行计算.
解答:解:(
+
)-(
-
),
=
+
-
+
,
=(
-
)+(
+
),
=
+
,
=
;
故答案为:×
| 13 |
| 11 |
| 7 |
| 9 |
| 13 |
| 11 |
| 7 |
| 9 |
=
| 13 |
| 11 |
| 7 |
| 9 |
| 13 |
| 11 |
| 7 |
| 9 |
=(
| 13 |
| 11 |
| 13 |
| 11 |
| 7 |
| 9 |
| 7 |
| 9 |
=
| 7 |
| 9 |
| 7 |
| 9 |
=
| 14 |
| 9 |
故答案为:×
点评:考查了分数四则混合运算的顺序,不要错用运算定律简算.
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