问题 解答题
神机妙算细又巧.(计算下面各题能简算的要简算)
(1)
5
7
×21×
3
10
(2)
18
35
÷0.6×
2
3
(3)2-
6
13
÷
9
26
-
2
3
(4)
9
10
×[
5
9
÷(
1
2
-
1
6
)]
(5)(0.25+
1
3
)×(1.6÷
4
5
)
(6)(
3
17
+
1
39
)×17+22÷39.
答案

(1)

5
7
×21×
3
10

=

5×21×3
7×10

=

9
2

(2)

18
35
÷0.6×
2
3

=

18
35
×
10
6
×
2
3

=

4
7

(3)2-

6
13
÷
9
26
-
2
3

=2-

4
3
-
2
3

=2-(

4
3
+
2
3
),

=2-2,

=0;

(4)

9
10
×[
5
9
÷(
1
2
-
1
6
)],

=

9
10
×[
5
9
÷
2
6
],

=

9
10
×
15
9

=

3
2

(5)(0.25+

1
3
)×(1.6÷
4
5
),

=

3
4
×2,

=

3
2

(6)(

3
17
+
1
39
)×17+22÷39,

=

3
17
×17+
1
39
×17+
22
39

=3+(

17
39
+
22
39
),

=3+1,

=4.

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