题目内容
简算下面各题.
|
|
|
分析:(1)先去掉括号,计算
-
=1,再与第三个数相减即可;
(2)(3)把分母相同的相加减,再求出的结果相加;
| 16 |
| 5 |
| 11 |
| 5 |
(2)(3)把分母相同的相加减,再求出的结果相加;
解答:解:(1)
-(
+
)
=
-
-
=1-
=
;
(2)
+
-
+
=(
-
)+(
+
)
=0+
=
;
(3)
+
+
+
=(
+
)+(
+
)
=1+1
=2.
| 16 |
| 5 |
| 11 |
| 5 |
| 2 |
| 9 |
=
| 16 |
| 5 |
| 11 |
| 5 |
| 2 |
| 9 |
=1-
| 2 |
| 9 |
=
| 7 |
| 9 |
(2)
| 4 |
| 5 |
| 4 |
| 16 |
| 4 |
| 5 |
| 4 |
| 16 |
=(
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 16 |
| 4 |
| 16 |
=0+
| 1 |
| 2 |
=
| 1 |
| 2 |
(3)
| 3 |
| 7 |
| 7 |
| 15 |
| 4 |
| 7 |
| 8 |
| 15 |
=(
| 3 |
| 7 |
| 4 |
| 7 |
| 7 |
| 15 |
| 8 |
| 15 |
=1+1
=2.
点评:此题考查了分数加减法的计算方法,先把同分母分数相加减,再进行解答.
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