早教吧 育儿知识 作业答案 考试题库 百科 知识分享

(2014•绵阳模拟)怎样算简便就怎样算.(1)57.5-14.25-1534(2)1.25×35×0.8(3)845÷[7.8+14×(2.75+1.25)](4)411×87.5+12.5×411-4÷11.

题目详情
(2014•绵阳模拟)怎样算简便就怎样算.
(1)57.5-14.25-15
3
4

(2)1.25×
3
5
×0.8
(3)8
4
5
÷[7.8+
1
4
×(2.75+1.25)]
(4)
4
11
×87.5+12.5×
4
11
-4÷11.
▼优质解答
答案和解析
(1)57.5-14.25-15
3
4

=57.5-(14.25+15.75)
=57.5-30
=27.5

(2)1.25×
3
5
×0.8
=1.25×0.8×0.6
=1×0.6
=0.6

(3)8
4
5
÷[7.8+
1
4
×(2.75+1.25)]
=8
4
5
÷[7.8+
1
4
×4]
=8.8÷8.8
=1

(4)
4
11
×87.5+12.5×
4
11
-4÷11
=
4
11
×87.5+12.5×
4
11
-
4
11

=
4
11
×(87.5+12.5-1)
=
4
11
×99
=36