题目内容

能简算的要简算
248-25
9
20
-22.05
12×(
1
4
+
1
6
-
1
3
)
6.25×6+3×6
1
4
+625%
1
4
17
×(2
2
3
-
3
4
)+17
11
12
÷
17
21
(9
8
11
-3
5
14
-1
9
14
1
4
分析:(1)(5)运用减法性质解答,
(2)(3)(4)运用乘法分配律解答.
解答:解:(1)248-25
9
20
-22.05,
=248-(25
9
20
+22.05),
=248-47.5,
=200.5;

(2)12×(
1
4
+
1
6
-
1
3
),
=12×
1
4
+12×
1
6
-12×
1
3

=3+2-4,
=1;

(3)6.25×6+3×6
1
4
+625%,
=6.25×(6+3+1),
=6.25×10,
=62.5;

(4)1
4
17
×(2
2
3
-
3
4
+17
11
12
÷
17
21

=1
4
17
×1
11
12
+17
11
12
÷
17
21

=1
4
17
×(1
11
12
+17
11
12
),
=1
4
17
×18
11
6

=24.5;

(5)(9
8
11
-3
5
14
-1
9
14
)×
1
4

=(9
8
11
-5)×
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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