题目内容
怎样算简便就怎样算
|
|
(
|
分析:(1)(2)运用加法交换律简算;
(3)运用乘法分配律简算.
(3)运用乘法分配律简算.
解答:解:(1)
+
+
,
=
+
+
,
=1+
,
=1
;
(2)
+
-
,
=
-
+
,
=0+
,
=
;
(3)(
+
)×36,
=
×36+
×36,
=2+1,
=3.
| 5 |
| 7 |
| 2 |
| 9 |
| 2 |
| 7 |
=
| 5 |
| 7 |
| 2 |
| 7 |
| 2 |
| 9 |
=1+
| 2 |
| 9 |
=1
| 2 |
| 9 |
(2)
| 2 |
| 7 |
| 5 |
| 6 |
| 2 |
| 7 |
=
| 2 |
| 7 |
| 2 |
| 7 |
| 5 |
| 6 |
=0+
| 5 |
| 6 |
=
| 5 |
| 6 |
(3)(
| 1 |
| 18 |
| 1 |
| 36 |
=
| 1 |
| 18 |
| 1 |
| 36 |
=2+1,
=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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