题目内容
直接写得数.
|
|
1-
|
| ||||||||||||||
|
|
|
| ||||||||||||||
3-1
|
|
分析:把3-1
和
-1中的整数化成分数,此题就都成了同分母分数的加减法运算,然后按同分母分数加减法的法则计算:只把分子相加减,分母不变.
| 1 |
| 7 |
| 19 |
| 17 |
解答:解:
+
=
;
+
=
; 1-
=
;
-
=
;
-
=
;
+
=1;
-1=
;
-
=
;
3-1
=1
;
+
=
.
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 3 |
| 5 |
| 17 |
| 7 |
| 17 |
| 12 |
| 17 |
| 2 |
| 7 |
| 5 |
| 7 |
| 7 |
| 16 |
| 5 |
| 16 |
| 1 |
| 8 |
| 19 |
| 91 |
| 12 |
| 91 |
| 1 |
| 13 |
| 7 |
| 13 |
| 6 |
| 13 |
| 19 |
| 17 |
| 2 |
| 17 |
| 7 |
| 16 |
| 3 |
| 16 |
| 1 |
| 4 |
3-1
| 1 |
| 7 |
| 6 |
| 7 |
| 7 |
| 5 |
| 6 |
| 5 |
| 13 |
| 5 |
点评:此题考查了同分母分数相加减的法则:只把分子相加减,分母不变.但要注意,能约分的要约分.
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