题目内容
计算下面各题
(
+
)×44
×
×
-
×
+
×
.
(
| 5 |
| 11 |
| 3 |
| 4 |
| 8 |
| 9 |
| 9 |
| 10 |
| 1 |
| 4 |
| 2 |
| 9 |
| 7 |
| 16 |
| 2 |
| 9 |
| 5 |
| 6 |
| 6 |
| 7 |
| 7 |
| 12 |
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据乘法分配律简算;
(2)按照从左到右的顺序计算;
(3)运用乘法分配律简算;
(4)先算乘法,再算加法.
(2)按照从左到右的顺序计算;
(3)运用乘法分配律简算;
(4)先算乘法,再算加法.
解答:
解:(1)(
+
)×44
=
×44+
×44
=20+33
=53;
(2)
×
×
=
×
=
;
(3)
-
×
=(1-
)×
=
×
=
;
(4)
+
×
=
+
=
.
| 5 |
| 11 |
| 3 |
| 4 |
=
| 5 |
| 11 |
| 3 |
| 4 |
=20+33
=53;
(2)
| 8 |
| 9 |
| 9 |
| 10 |
| 1 |
| 4 |
=
| 4 |
| 5 |
| 1 |
| 4 |
=
| 1 |
| 5 |
(3)
| 2 |
| 9 |
| 7 |
| 16 |
| 2 |
| 9 |
=(1-
| 7 |
| 16 |
| 2 |
| 9 |
=
| 9 |
| 16 |
| 2 |
| 9 |
=
| 1 |
| 8 |
(4)
| 5 |
| 6 |
| 6 |
| 7 |
| 7 |
| 12 |
=
| 5 |
| 6 |
| 1 |
| 2 |
=
| 4 |
| 3 |
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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