问题 解答题
计算下面各题.
39×26-25×121.25×(3.2-2.4)÷11
4
9
×
2
5
+
3
5
×
4
9
7
9
÷
7
10
×
3
8
1
5
-
3
8
×
4
9
)÷
3
5
6
7
÷[(1+
1
2
)÷
1
2
].
答案

(1)39×26-25×12,

=1014-300,

=714;

(2)1.25×(3.2-2.4)÷11,

=1.25×0.8÷11,

=1÷11,

=

1
11

(3)

4
9
×
2
5
+
3
5
×
4
9

=

4
9
×(
2
5
+
3
5
),

=

4
9
×1,

=

4
9

(4)

7
9
÷
7
10
×
3
8

=

7
9
×
10
7
×
3
8

=

5
12

(5)(

1
5
-
3
8
×
4
9
)÷
3
5

=(

1
5
-
1
6
)÷
3
5

=

1
30
÷
3
5

=

1
18

(6)

6
7
÷[(1+
1
2
)÷
1
2
],

=

6
7
÷[
3
2
÷
1
2
],

=

6
7
÷3,

=

2
7

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