题目内容
脱式计算.
|
8-
|
1-
| ||||||||||||||||||||
|
|
|
分析:(1)(2)通分计算;
(3)(5)运用减法的性质简算;
(4)先算括号内的,再算括号外的;
(6)运用加法交换律与结合律简算.
(3)(5)运用减法的性质简算;
(4)先算括号内的,再算括号外的;
(6)运用加法交换律与结合律简算.
解答:解:(1)
+
+
=
+
+
=
;
(2)8-
-
=
-
-
=
;
(3)1-
-
+
=1-(
+
)+
=1-1+
=
;
(4)
-(
+
)
=
-
=
;
(5)
-(
-
)
=
-
+
=
;
(6)
-
+
+
=(
+
)-(
-
)
=
.
| 2 |
| 3 |
| 1 |
| 2 |
| 3 |
| 8 |
=
| 16 |
| 24 |
| 12 |
| 24 |
| 9 |
| 24 |
=
| 37 |
| 24 |
(2)8-
| 7 |
| 14 |
| 5 |
| 13 |
=
| 1456 |
| 182 |
| 91 |
| 182 |
| 70 |
| 182 |
=
| 1295 |
| 182 |
(3)1-
| 1 |
| 5 |
| 4 |
| 5 |
| 4 |
| 7 |
=1-(
| 1 |
| 5 |
| 4 |
| 5 |
| 4 |
| 7 |
=1-1+
| 4 |
| 7 |
=
| 4 |
| 7 |
(4)
| 7 |
| 8 |
| 1 |
| 4 |
| 1 |
| 5 |
=
| 7 |
| 8 |
| 9 |
| 20 |
=
| 17 |
| 40 |
(5)
| 4 |
| 5 |
| 4 |
| 5 |
| 2 |
| 3 |
=
| 4 |
| 5 |
| 4 |
| 5 |
| 2 |
| 3 |
=
| 2 |
| 3 |
(6)
| 9 |
| 11 |
| 2 |
| 5 |
| 2 |
| 5 |
| 5 |
| 11 |
=(
| 9 |
| 11 |
| 5 |
| 11 |
| 2 |
| 5 |
| 2 |
| 5 |
=
| 14 |
| 11 |
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律或性质进行简便计算.
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