问题 解答题
计算题.
1
3
÷
3
5
+0.4

3
4
×
3
8
+
3
4
×
5
8

12÷[(
7
9
-
2
3
)×
9
10
].
答案

(1)

1
3
÷(
3
5
+0.4),

=

1
3
÷1,

=

1
3

(2)

3
4
×
3
8
+
3
4
×
5
8

=

3
4
×(
3
8
+
5
8
),

=

3
4
×1,

=

3
4

(3)12÷[(

7
9
-
2
3
)×
9
10
],

=12÷[

1
9
×
9
10
],

=12÷

1
10

=120.

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