题目内容
简算:
75×(
|
|
|
分析:(1)(3)运用乘法分配律解答,
(2)依据减法性质解答.
(2)依据减法性质解答.
解答:解:(1)75×(
+
),
=75×
+75×
,
=6+30,
=36;
(2)
-
-
,
=
-(
+
),
=
-1,
=
;
(3)
÷9+
×
,
=(
+
)×
,
=1×
,
=
.
| 2 |
| 25 |
| 2 |
| 5 |
=75×
| 2 |
| 25 |
| 2 |
| 5 |
=6+30,
=36;
(2)
| 13 |
| 12 |
| 4 |
| 9 |
| 5 |
| 9 |
=
| 13 |
| 12 |
| 4 |
| 9 |
| 5 |
| 9 |
=
| 13 |
| 12 |
=
| 1 |
| 12 |
(3)
| 8 |
| 17 |
| 1 |
| 9 |
| 9 |
| 17 |
=(
| 8 |
| 17 |
| 9 |
| 17 |
| 1 |
| 9 |
=1×
| 1 |
| 9 |
=
| 1 |
| 9 |
点评:解答本题要注意分析各数,选用合适的简便算法.
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