问题 解答题
(1)
11
12
+
5
8
+
3
8
+
1
12
(2)3.25×27+73×3.25(3)
7
9
-
1
8
+
2
9
-
3
8
答案

(1)

11
12
+
5
8
+
3
8
+
1
12

=(

11
12
+
1
12
)+(
5
8
+
3
8
),

=1+1,

=2;

(2)3.25×27+73×3.25,

=3.25×(27+73),

=3.25×100,

=325;

(3))

7
9
-
1
8
+
2
9
-
3
8

=(

7
9
+
2
9
)-(
1
8
+
3
8
),

=1-

1
2

=

1
2

单项选择题
单项选择题