问题 解答题
用递等式计算.
3060÷15-2.5×1.04
7
5
×
2
3
+
14
15
÷
1
9
0.16+4÷(
3
8
-
1
8
3
7
-[
19
5
-(
14
5
+
4
7
)]
3
5
÷[(
1
5
+
1
3
)÷
2
9
].
答案

3060÷15-2.5×1.04,

=204-2.6,

=201.4;

7
5
×
2
3
+
14
15
÷
1
9

=

14
15
+
14
15
×9,

=

14
15
×(1+9),

=

14
15
×10,

=

28
3

=9

1
3

0.16+4÷(

3
8
-
1
8
),

=0.16+4÷

1
4

=0.16+4×4,

=0.16+16,

=16.16;

3
7
-[
19
5
-(
14
5
+
4
7
)],

=

3
7
-
19
5
+
14
5
+
4
7

=(

3
7
+
4
7
)-(
19
5
-
14
5
),

=1-1,

=0;

3
5
÷[(
1
5
+
1
3
)÷
2
9
]

=

3
5
÷(
3
15
 +
5
15
)×
2
9

=

3
5
×
15
8
×
2
9

=

1
4

单项选择题 A1/A2型题
判断题