题目内容
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分析:此题属于同分母分数的加减法,只把分子相加减,分母不变.但有的要灵活简算,如
+
-
,运用加法结合律简算;
-
-
运用减法的性质简算.
| 7 |
| 10 |
| 1 |
| 10 |
| 1 |
| 10 |
| 10 |
| 21 |
| 8 |
| 21 |
| 2 |
| 21 |
解答:解:
+
=
;
+
=1;
-
=
;
+
=
;
+
+
=
;
+
-
=
;
-
-
=0;
-
+
=
.
| 1 |
| 8 |
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 6 |
| 9 |
| 14 |
| 5 |
| 14 |
| 2 |
| 7 |
| 11 |
| 25 |
| 9 |
| 25 |
| 4 |
| 5 |
| 7 |
| 18 |
| 1 |
| 18 |
| 5 |
| 18 |
| 13 |
| 18 |
| 7 |
| 10 |
| 1 |
| 10 |
| 1 |
| 10 |
| 7 |
| 10 |
| 10 |
| 21 |
| 8 |
| 21 |
| 2 |
| 21 |
| 9 |
| 16 |
| 5 |
| 16 |
| 3 |
| 16 |
| 7 |
| 16 |
点评:此题考查了同分母分数相加减的方法以及灵活运用所学知识进行简算的能力.
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