问题 解答题
计算.注意使用简便算法
3
5
×
4
11
+
7
11
÷
5
3
2-
7
11
-
2
3
÷
8
5
5
9
÷[(
2
3
-
1
4
8
15
]
答案

(1)

3
5
×
4
11
+
7
11
÷
5
3

=

3
5
×
4
11
+
7
11
×
3
5

=

3
5
×(
4
11
+
7
11
),

=

3
5
×1,

=

3
5

(2)2-

7
11
-
2
3
÷
8
5

=2-

7
11
-
5
12

=1

4
11
-
5
12

=

125
132

(3)

5
9
÷[(
2
3
-
1
4
8
15
],

=

5
9
÷[(
5
12
×
8
15
],

=

5
9
÷
2
9

=

5
2

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