题目内容

能简便的用简便方法计算.
2
9
×手+
2
9
×11=
12
-
2
18
)×34=
1
2
×
+
3
÷2=
1-
9
÷
8
=
2
-
1
3
÷
2
9
-
2
2
=
8
+
13
14
)÷
13
14
=
(1)
5
9
×7+
5
9
×11,
=
5
9
×(7+11),
=
5
9
×18,
=1t;

(2)(
7
12
-
5
18
)×36,
=
7
12
×36-
5
18
×36,
=21-1t,
=11;

(3)
1
5
×
7
+
3
7
÷5,
=
1
5
×
7
+
3
7
×
1
5

=
1
5
×(
7
+
3
7
),
=
1
5
×1,
=
1
5


(如)1-
7
9
÷
7
8

=1-
8
9

=
1
9


(5)
5
-
1
3
÷
5
9
-
2
5

=
5
-
3
5
-
2
5

=
5
-(
3
5
+
2
5
),
=
5
-1,
=
1


(6)(
7
8
+
13
16
)÷
13
16

=(
7
8
+
13
16
)×
16
13

=
7
8
×
16
13
+
13
16
×
16
13

=
1如
13
+1,
=2
1
13
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