问题 解答题
能用简便方法的要用简便方法.
①58-16÷
4
5

2
9
-
6
15
×
2
9

③62.5÷2.5÷4
④8160÷24-36×2.536×(
5
6
+
1
12
-
1
3
)
3.5÷[1-(0.4+
1
4
)]
答案

①58-16÷

4
5

=58-20,

=38;

2
9
-
6
15
×
2
9

=(1-

6
15
)×
2
9

=

9
15
×
2
9

=

2
15

③62.5÷2.5÷4,

=62.5÷(2.5×4),

=62.5÷10,

=6.25;

④8160÷24-36×2.5,

=340-90,

=250;

36×(

5
6
+
1
12
-
1
3
),

=36×

5
6
+36×
1
12
-36×
1
3

=30+3-12,

=21;

3.5÷[1-(0.4+

1
4
)],

=3.5÷[1-0.65],

=3.5÷0.35,

=10.

解答题
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