试题:
怎样简便怎样算.
2
3
+
1
4
+
3
4
3
8
+
1
4
+
1
8
1-
3
5
-
2
5
9
7
+
5
8
+
11
8
+
5
7
3
5
+
1
12
)+(
2
5
+
5
12
)
+(
2
5
+
5
12
)

答案:

我来补答
(1)
2
3
+
1
4
+
3
4

=
2
3
+(
1
4
+
3
4
),
=
2
3
+1,
=1
2
3


(2)
3
8
+
1
4
+
1
8

=(
3
8
+
1
8
)+
1
4

=
1
2
+
1
4

=
3
4


(3)1-
3
5
-
2
5

=1-(
3
5
+
2
5
),
=1-1,
=0;

(4)
9
7
+
5
8
+
11
8
+
5
7

=(
9
7
+
5
7
)+(
5
8
+
11
8
),
=2+2,
=4;

(5)(
3
5
+
1
12
)+(
2
5
+
5
12
),
=
3
5
+
1
12
+
2
5
+
5
12

=(
3
5
+
2
5
)+(
1
12
+
5
12
),
=1+
1
2

=1
1
2
 
 
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