试题与答案

脱式计算. 25×124+3600÷240  5.02-1.25-2.75 (4

题型:解答题

题目:

脱式计算.
25×124+3600÷240   5.02-1.25-2.75 
4
5
-
1
4
)÷
11
12
+
1
6
1-(4.3×0.2-0.106)[1-(
2
5
+
1
3
)]÷
2
5
 
1
6
+
1
4
-
1
3
)×12.

答案:

(1)25×124+3600÷240,

=3100+15,

=3115;

(2)5.02-1.25-2.75,

=5.02-(1.25+2.75),

=5.02-4,

=1.02;

(3)(

4
5
-
1
4
)÷
11
12
+
1
6

=

11
20
÷
11
12
+
1
6

=

3
5
+
1
6

=

23
30

(4)1-(4.3×0.2-0.106),

=1-(0.86-0.106),

=1-0.754,

=0.246;

(5)[1-(

2
5
+
1
3
)]÷
2
5

=[1-

11
15
]÷
2
5

=

4
15
÷
2
5

=

2
3

(6)(

1
6
+
1
4
-
1
3
)×12,

=

1
6
×12+
1
4
×12-
1
3
×12,

=2+3-4,

=1.

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