问题 解答题
用简便方法计算.
1
4
+
1
5
+
1
6
)×60
5
7
÷
4
5
+
2
7
÷
4
5
47-
8
17
-
3
17
×3
2
5
+
7
25
×
5
7
+
1
5
答案

(1)(

1
4
+
1
5
+
1
6
)×60,

=

1
4
×60+
1
5
×60+
1
6
×60,

=15+12+10,

=27+10,

=37;

(2)

5
7
÷
4
5
+
2
7
÷
4
5

=

5
7
×
5
4
+
2
7
×
5
4

=(

5
7
+
2
7
)×
5
4

=1×

5
4

=

5
4

(3)47-

8
17
-
3
17
×3,

=47-

8
17
-
9
17

=47-(

8
17
+
9
17
),

=47-1,

=46;

(4)

2
5
+
7
25
×
5
7
+
1
5

=

2
5
+
1
5
+
1
5

=

3
5
+
1
5

=

4
5

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