问题 解答题
计算下面各题,能简算的要写出主要简算过程.
(1)
1
6
+
5
8
×
4
15
(2)
1
6
+
2
9
+
5
6
+
3
9
(3)
1
6
×
2
3
÷(
4
5
-
8
15
(4)〔1-(
3
4
-
5
7
)〕×
7
9
答案

(1)

1
6
+
5
8
×
4
15

=

1
6
+
1
6

=

1
3

(2)

1
6
+
2
9
+
5
6
+
3
9

=(

1
6
+
5
6
)+(
3
9
+
2
9
),

=1+

5
9

=1

5
9

(3)

1
6
×
2
3
÷(
4
5
-
8
15
),

=

1
6
×
2
3
÷
4
15

=

1
9
×
15
4

=

5
12

(4)[1-(

3
4
-
5
7
)]×
7
9

=[1-

1
28
7
9

=

27
28
×
7
9

=

3
4

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