题目内容

用简便方法计算.
2
9
-
7
16
×
2
9
2
5
×4×
4
5
5
7
-
5
9
×
5
7
87×
3
86
1
5
+
2
3
)×15
1
2
×
1
15
+
1
3
×
1
2
5
6
×
5
9
+
5
9
×
1
6
(1)
2
9
-
7
16
×
2
9

=(1-
7
16
)×
2
9

=
9
16
×
2
9

=
1
8


(2)
2
5
×4×
4
5

=
8
5
×
4
5

=
32
25


(3)
5
7
-
5
9
×
5
7

=(1-
5
9
)×
5
7

=
4
9
×
5
7

=
20
63


(4)87×
3
86

=(86+1)×
3
86

=86×
3
86
+1×
3
86

=3+
3
86

=3
3
86


(5)(
1
5
+
2
3
)×15,
=
1
5
×15+
2
3
×15,
=3+10,
=13;

(6)
1
2
×
1
15
+
1
3
×
1
2

=(
1
15
+
1
3
)×
1
2

=
2
5
×
1
2

=
1
5


(7)
5
6
×
5
9
+
5
9
×
1
6

=(
5
6
+
1
6
)×
5
9

=1×
5
9

=
5
9
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