题目内容

计算下面各题,怎样简便就怎样算.
(1)69.4-5.185÷1.7-13.9×0.5
(2)5×(
1
15
+
2
17
)×17
(3)
1
13
+
12
13
×(
5
2
-
1
3

(4)
3
13
×
3
4
+
10
13
÷
4
3
(1)69.4-5.185÷1.7-13.9×0.5,
=69.4-3.05-6.95,
=69.4-(3.05+6.95),
=69.4-10,
=59.4;

(2)5×(
1
15
+
2
17
)×17
=5×17×
1
15
+5×17×
2
17

=
17
3
+10,
=15
2
3


(3)
1
13
+
12
13
×(
5
2
-
1
3
),
=
1
13
+
12
13
×
5
2
-
1
3
×
12
13

=
1
13
+
30
13
-
4
13

=
27
13


(4)
3
13
×
3
4
+
10
13
÷
4
3

=
3
13
×
3
4
+
10
13
×
3
4

=
3
4
×(
10
13
+
3
13
),
=
3
4
×1,
=
3
4
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