题目内容
计算下列各题,能简算的要简算.
+
-
-(
+
)
-(
-
)
+
+
+
.
| 2 |
| 3 |
| 4 |
| 5 |
| 3 |
| 10 |
| 11 |
| 8 |
| 5 |
| 6 |
| 3 |
| 8 |
| 6 |
| 7 |
| 11 |
| 14 |
| 1 |
| 2 |
| 5 |
| 9 |
| 4 |
| 11 |
| 6 |
| 11 |
| 4 |
| 9 |
分析:(1)直接运用分数的加减法进行计算即可得到答案;
(2)先利用加法交换律,交换
与
的位置,再用
减去
再减去
,最后结果不变;
(3)直接运用分数减法进行计算即可得到答案;
(4)利用加法交换律交换
与
的位置,然后再利用加法结合律进行计算即可得到答案.
(2)先利用加法交换律,交换
| 5 |
| 6 |
| 3 |
| 8 |
| 11 |
| 8 |
| 3 |
| 8 |
| 5 |
| 6 |
(3)直接运用分数减法进行计算即可得到答案;
(4)利用加法交换律交换
| 4 |
| 11 |
| 4 |
| 9 |
解答:解:(1)
+
-
=
-
,
=1
;
(2)
-(
+
)
=
-(
+
),
=
-
-
,
=1-
,
=
;
(3)
-(
-
)
=
-
,
=
;
(4)
+
+
+
=(
+
)+(
+
),
=1+
,
=1
;
| 2 |
| 3 |
| 4 |
| 5 |
| 3 |
| 10 |
=
| 22 |
| 15 |
| 3 |
| 10 |
=1
| 1 |
| 6 |
(2)
| 11 |
| 8 |
| 5 |
| 6 |
| 3 |
| 8 |
=
| 11 |
| 8 |
| 3 |
| 8 |
| 5 |
| 6 |
=
| 11 |
| 8 |
| 3 |
| 8 |
| 5 |
| 6 |
=1-
| 5 |
| 6 |
=
| 1 |
| 6 |
(3)
| 6 |
| 7 |
| 11 |
| 14 |
| 1 |
| 2 |
=
| 6 |
| 7 |
| 2 |
| 7 |
=
| 4 |
| 7 |
(4)
| 5 |
| 9 |
| 4 |
| 11 |
| 6 |
| 11 |
| 4 |
| 9 |
=(
| 5 |
| 9 |
| 4 |
| 9 |
| 6 |
| 11 |
| 4 |
| 11 |
=1+
| 10 |
| 11 |
=1
| 10 |
| 11 |
点评:此题主要考查的是分数的加减法及加法运算定律的应用.
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