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“考考你”下面各题怎么算简便就怎么算?710×101-71089×89÷89×8935×99+35(47+89)×2251521×34+1021×34-34345×2536×3435(56-59)×185.

题目详情
“考考你”下面各题怎么算简便就怎么算?
7
10
×101-
7
10
8
9
×
8
9
÷
8
9
×
8
9
3
5
×99+
3
5
( 
4
7
+
8
9
)×
2
25
15
21
×
3
4
+
10
21
×
3
4
-
3
4
3
4
5
×25
36×
34
35
( 
5
6
-
5
9
)×
18
5
▼优质解答
答案和解析
(1)
7
10
×101-
7
10

=
7
10
×(101-1),
=
7
10
×100,
=70;

(2)
8
9
×
8
9
÷
8
9
×
8
9

=
8
9
×
8
9
×
9
8
×
8
9

=(
8
9
×
8
9
)×(
9
8
×
8
9
),
=
64
81
×1,
=
64
81


(3)
3
5
×99+
3
5

=
3
5
×(99+1),
=
3
5
×100,
=60;

(4)( 
4
7
+
8
9
)×
2
25

=
92
63
×
2
25

=
184
1575


(5)
15
21
×
3
4
+
作业帮用户 2016-12-01