题目内容
能简算的要简算
|
|
6-
|
分析:(1)把除法改为乘法,运用乘法分配律简算;
(2)运用加法交换律与结合律简算;
(3)运用减法的性质简算.
(2)运用加法交换律与结合律简算;
(3)运用减法的性质简算.
解答:解:(1)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(2)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(3)6-
-
,
=6-(
+
),
=6-1,
=5.
| 2 |
| 7 |
| 8 |
| 35 |
| 35 |
| 8 |
| 5 |
| 7 |
=
| 2 |
| 7 |
| 35 |
| 8 |
| 35 |
| 8 |
| 5 |
| 7 |
=(
| 2 |
| 7 |
| 5 |
| 7 |
| 35 |
| 8 |
=1×
| 35 |
| 8 |
=
| 35 |
| 8 |
(2)
| 5 |
| 7 |
| 5 |
| 6 |
| 2 |
| 7 |
| 1 |
| 6 |
=(
| 5 |
| 7 |
| 2 |
| 7 |
| 5 |
| 6 |
| 1 |
| 6 |
=1+1,
=2;
(3)6-
| 3 |
| 4 |
| 1 |
| 4 |
=6-(
| 3 |
| 4 |
| 1 |
| 4 |
=6-1,
=5.
点评:此题主要考查分数的四则混合运算,注意应用运算定律进行简便计算.
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