早教吧 育儿知识 作业答案 考试题库 百科 知识分享

(2012•龙泉驿区)怎样简便就怎样计算,能简算的写清楚简算过程要计分.5+(20÷1.6)×6.8×825%÷19+0.25+5.6×1434÷[712-(59+56)×325].

题目详情
(2012•龙泉驿区)怎样简便就怎样计算,能简算的写清楚简算过程要计分.
5+(20÷1.6)×6.8×8
25%÷
1
9
+0.25+5.6×
1
4

3
4
÷[
7
12
-(
5
9
+
5
6
)×
3
25
].
▼优质解答
答案和解析
(1)5+(20÷1.6)×6.8×8,
=5+20÷1.6×6.8×8,
=5+20×8÷1.6×6.8,
=5+160÷1.6×6.8,
=5+100×6.8,
=5+680,
=685;

(2)25%÷
1
9
+0.25+5.6×
1
4

=
1
4
×9+
1
4
+5.6×
1
4

=
1
4
×(9+1+5.6),
=
1
4
×15.6,
=3.9;

(3)
3
4
÷[
7
12
-(
5
9
+
5
6
)×
3
25
],
=
3
4
÷[
7
12
-
25
18
×
3
25
],
=
3
4
÷[
7
12
-
1
6
],
=
3
4
÷
5
12

=
3
4
×
12
5

=
9
5