题目内容

简便计算.
15
28
×
5
8
+
5
8
×
13
28
7
9
+
5
6
-
1
4
)×72
18.38+4.62-2.38.
15
28
×
5
8
+
5
8
×
13
28

=
5
8
×(
15
28
+
13
28
),
=
5
8
×
1,
=
5
8

②(
7
9
+
5
6
-
1
4
)×72,
=72×
7
9
+72×
5
6
-
1
4
×72,
=56+60-18,
=98;
③18.38+4.62-2.38,
=(18.38-2.38)+4.62,
=16+4.62,
=20.62.
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