题目内容
下面各题怎样算简便就怎样算．
-（
+
）
2-
÷
-
÷8+
×
．
| 34 |
| 13 |
| 4 |
| 15 |
| 2 |
| 5 |
2-
| 3 |
| 8 |
| 7 |
| 16 |
| 1 |
| 7 |
| 5 |
| 12 |
| 1 |
| 8 |
| 7 |
| 12 |
分析：根据分数的简便运算进行计算即可得到答案．
解答：解：①
-（
+
）
=
-
=
-
=1
；
②2-
÷
-
=2-（
×
-
）
=2-（
+
）
=2-1
=1；
③
÷8+
×
=
×
+
×
=（
+
）×
=1×
=
．
| 34 |
| 13 |
| 4 |
| 15 |
| 2 |
| 5 |
=
| 34 |
| 13 |
| 2 |
| 3 |
=
| 102 |
| 39 |
| 26 |
| 39 |
=1
| 37 |
| 39 |
②2-
| 3 |
| 8 |
| 7 |
| 16 |
| 1 |
| 7 |
=2-（
| 3 |
| 8 |
| 16 |
| 7 |
| 1 |
| 7 |
=2-（
| 6 |
| 7 |
| 1 |
| 7 |
=2-1
=1；
③
| 5 |
| 12 |
| 1 |
| 8 |
| 7 |
| 12 |
=
| 5 |
| 12 |
| 1 |
| 8 |
| 1 |
| 8 |
| 7 |
| 12 |
=（
| 5 |
| 12 |
| 7 |
| 12 |
| 1 |
| 8 |
=1×
| 1 |
| 8 |
=
| 1 |
| 8 |
点评：此题主要考查的是分数的简便运算和分数的四则混合运算．
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