题目内容
脱式计算.
-
-
-
-
-
-
.
| 18 |
| 19 |
| 7 |
| 19 |
| 8 |
| 19 |
| 15 |
| 16 |
| 3 |
| 8 |
| 1 |
| 2 |
| 15 |
| 24 |
| 5 |
| 24 |
| 1 |
| 24 |
分析:(1)运用减法的性质,把原式变为
-(
+
),计算即可;
(2)此题应先通分,然后运用减法的性质简算;
(3)从左往右依次计算.
| 18 |
| 19 |
| 7 |
| 19 |
| 8 |
| 19 |
(2)此题应先通分,然后运用减法的性质简算;
(3)从左往右依次计算.
解答:解:(1)
-
-
,
=
-(
+
),
=
-
,
=
;
(2)
-
-
,
=
-
-
,
=
-(
+
)
=
-
,
=
;
(3)
-
-
,
=
-
,
=
,
=
.
| 18 |
| 19 |
| 7 |
| 19 |
| 8 |
| 19 |
=
| 18 |
| 19 |
| 7 |
| 19 |
| 8 |
| 19 |
=
| 18 |
| 19 |
| 15 |
| 19 |
=
| 3 |
| 19 |
(2)
| 15 |
| 16 |
| 3 |
| 8 |
| 1 |
| 2 |
=
| 15 |
| 16 |
| 6 |
| 16 |
| 8 |
| 16 |
=
| 15 |
| 16 |
| 6 |
| 16 |
| 8 |
| 16 |
=
| 15 |
| 16 |
| 14 |
| 16 |
=
| 1 |
| 16 |
(3)
| 15 |
| 24 |
| 5 |
| 24 |
| 1 |
| 24 |
=
| 10 |
| 24 |
| 1 |
| 24 |
=
| 9 |
| 24 |
=
| 3 |
| 8 |
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.
练习册系列答案
相关题目