题目内容
| 19 |
| 17 |
| 1 |
| 3 |
| 3 |
| 5 |
| 4 |
| 9 |
分析:先算除法,然后运用减法的性质简算.
解答:解:
-
÷
-
,
=
-
×
-
,
=
-
-
,
+=
-(
-
),
=
-1,
=
.
| 19 |
| 17 |
| 1 |
| 3 |
| 3 |
| 5 |
| 4 |
| 9 |
=
| 19 |
| 17 |
| 1 |
| 3 |
| 5 |
| 3 |
| 4 |
| 9 |
=
| 19 |
| 17 |
| 5 |
| 9 |
| 4 |
| 9 |
+=
| 19 |
| 17 |
| 5 |
| 9 |
| 4 |
| 9 |
=
| 19 |
| 17 |
=
| 2 |
| 17 |
点评:此题考查了分数的四则混合运算,注意运算顺序,灵活运用所学的运算律简便计算.
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