题目内容

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.
(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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