题目内容
| 计算.(能简算的要简算) (16.5×3+7.5×3)÷6 |
|
3.25+(
|
分析:(1)先把小括号里面的计算运用乘法分配律简算,再算括号外的除法;
(2)运用加法交换律简算;
(3)运用加法结合律简算.
(2)运用加法交换律简算;
(3)运用加法结合律简算.
解答:解:(1)(16.5×3+7.5×3)÷6,
=[(16.5+7.5)×3]÷6,
=[24×3]÷6,
=72÷6,
=12;
(2)
+
-
,
=
-
+
,
=0+
,
=
;
(3)3.25+(
+
),
=(3.25+
)+
,
=4+
,
=4
.
=[(16.5+7.5)×3]÷6,
=[24×3]÷6,
=72÷6,
=12;
(2)
| 5 |
| 8 |
| 5 |
| 7 |
| 5 |
| 8 |
=
| 5 |
| 8 |
| 5 |
| 8 |
| 5 |
| 7 |
=0+
| 5 |
| 7 |
=
| 5 |
| 7 |
(3)3.25+(
| 3 |
| 4 |
| 3 |
| 8 |
=(3.25+
| 3 |
| 4 |
| 3 |
| 8 |
=4+
| 3 |
| 8 |
=4
| 3 |
| 8 |
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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