早教吧 育儿知识 作业答案 考试题库 百科 知识分享

怎样简便就怎样算7.8×101514÷59×64-159×[34-(716-14)]34×0.53+75%×1.4725×3.2×1.2530514÷1514.

题目详情
怎样简便就怎样算
7.8×101
5
14
÷
5
9
×64-1
5
9
×[
3
4
-(
7
16
-
1
4
)]
3
4
×0.53+75%×1.47
25×3.2×1.25 30
5
14
÷
15
14
▼优质解答
答案和解析

(1)7.8×101,
=7.8×(100+1),
=7.8×100+7.8×1,
=780+7.8,
=787.8;

(2)
5
14
÷
5
9
×64-1,
=
9
14
×64-1,
=41
1
7
-1,
=40
1
7


(3)
5
9
×[
3
4
-(
7
16
-
1
4
)],
=
5
9
×[
3
4
-
7
16
+
1
4
],
=
5
9
×[1-
7
16
],
=
5
9
×
9
16

=
5
16


(4)
3
4
×0.53+75%×1.47,
=0.75×0.53+0.75×1.47,
=0.75×(0.53+1.47),
=0.75×2,
=1.5;

(5)25×3.2×1.25,
=25×(4×0.8)×1.25,
=(25×4)×(0.8×1.25),
=100×1,
=100;

(6) 30
5
14
÷
15
14

=(30+
5
14
)×
14
15

=30×
14
15
+
5
14
×
14
15

=28+
1
3

=28
1
3