题目内容
怎样算简便就怎样算.
|
4.05-2.8-2.7 | 12×(
|
分析:(1)根据乘法分配律进行简算;
(2)4.05连续减去2.8与2.7,等于减去2.8与2.7的和;
(3)根据乘法分配律进行简算.
(2)4.05连续减去2.8与2.7,等于减去2.8与2.7的和;
(3)根据乘法分配律进行简算.
解答:解:(1)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(2)4.05-2.8-2.7,
=4.05-(2.8+2.7),
=4.05-5.5,
=-1.45;
(3)12×(
+
-
),
=12×
+12×
-12×
,
=3+2-4,
=5-4.
=1.
| 2 |
| 5 |
| 3 |
| 7 |
| 3 |
| 5 |
| 3 |
| 7 |
=(
| 2 |
| 5 |
| 3 |
| 5 |
| 3 |
| 7 |
=1×
| 3 |
| 7 |
=
| 3 |
| 7 |
(2)4.05-2.8-2.7,
=4.05-(2.8+2.7),
=4.05-5.5,
=-1.45;
(3)12×(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=12×
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=3+2-4,
=5-4.
=1.
点评:根据题意,找准所运用的运算定律,然后再进一步计算即可.
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