题目内容
能简算的要简算
248-25
|
12×(
| ||||||||||||
6.25×6+3×6
|
1
| ||||||||||||
(9
|
分析:(1)(5)运用减法性质解答,
(2)(3)(4)运用乘法分配律解答.
(2)(3)(4)运用乘法分配律解答.
解答:解:(1)248-25
-22.05,
=248-(25
+22.05),
=248-47.5,
=200.5;
(2)12×(
+
-
),
=12×
+12×
-12×
,
=3+2-4,
=1;
(3)6.25×6+3×6
+625%,
=6.25×(6+3+1),
=6.25×10,
=62.5;
(4)1
×(2
-
)+17
÷
,
=1
×1
+17
÷
,
=1
×(1
+17
),
=1
×18
,
=24.5;
(5)(9
-3
-1
)×
,
=(9
-5)×
,
=4
×
,
=1
.
9 |
20 |
=248-(25
9 |
20 |
=248-47.5,
=200.5;
(2)12×(
1 |
4 |
1 |
6 |
1 |
3 |
=12×
1 |
4 |
1 |
6 |
1 |
3 |
=3+2-4,
=1;
(3)6.25×6+3×6
1 |
4 |
=6.25×(6+3+1),
=6.25×10,
=62.5;
(4)1
4 |
17 |
2 |
3 |
3 |
4 |
11 |
12 |
17 |
21 |
=1
4 |
17 |
11 |
12 |
11 |
12 |
17 |
21 |
=1
4 |
17 |
11 |
12 |
11 |
12 |
=1
4 |
17 |
11 |
6 |
=24.5;
(5)(9
8 |
11 |
5 |
14 |
9 |
14 |
1 |
4 |
=(9
8 |
11 |
1 |
4 |
=4
8 |
11 |
1 |
4 |
=1
2 |
11 |
点评:本题考查知识点:选择正确简便算法进行计算.
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