问题 解答题
计算下面各题,能简算的要简算.
4
9
×
1
5
÷
4
5

(15-14×
4
7
)×
8
21
÷[(
1
3
+
2
5
)×
4
11
]

2
7
×
8
9
+
5
7
×
8
9
答案

(1)

4
9
×
1
5
÷
4
5

=

4
9
×
1
5
×
5
4

=

1
9

(2)(15-14×

4
7
)×
8
21
÷[(
1
3
+
2
5
)×
4
11
],

=(15-8)×

8
21
÷[
11
15
×
4
11
],

=7×

8
21
÷
4
15

=7×

8
21
×
15
4

=10;

(3)

2
7
×
8
9
+
5
7
×
8
9

=(

2
7
+
5
7
)×
8
9

=1×

8
9

=

8
9

单项选择题
单项选择题