题目内容

用简便方法计算.
5
7
×
14
15
×
3
8
(
1
3
-
1
9
27
31
8
9
×
3
4
+
1
9
×
3
4
23
30
×29+
23
30
(1)
5
7
×
14
15
×
3
8

=
2
3
×
3
8

=
1
4


(2)(
1
3
-
1
9
)×
27
31

=
1
3
×
27
31
-
1
9
×
27
31

=
9
31
-
3
31

=
6
31


(3)
8
9
×
3
4
+
1
9
×
3
4

=(
8
9
+
1
9
)×
3
4

=1×
3
4

=
3
4


(4)
23
30
×29+
23
30

=
23
30
×(29+1)
=
23
30
×30
=23.
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