问题 解答题
脱式计算.
205×68-8960
(2808÷26-10.8)×2.5
2
2
5
-2
2
5
÷1
3
5
×1
1
2
+1
2
3

2
3
÷[1
2
5
×(0.5+
1
3
)].
答案

(1)205×68-8960,

=13940-8960,

=4980;

(2)(2808÷26-10.8)×2.5,

=(108-10.8)×2.5,

=97.2×2.5,

=243;

(3)2

2
5
-2
2
5
÷1
3
5
×1
1
2
+1
2
3

=2

2
5
-
3
2
×1
1
2
+1
2
3

=2

2
5
-
9
4
+1
2
3

=

3
20
+1
2
3

=1

49
60

(4)

2
3
÷[1
2
5
×(0.5+
1
3
)],

=

2
3
÷[1
2
5
×
5
6
],

=

2
3
÷
7
6

=

4
7

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