题目内容

2
71
+
1
69
)×23+
25
71
2÷7×
2
7
3
5
+
2
5
-
3
5
+
2
5
1
2
×
1
3
+
1
2
×
1
3
5
8
×98+
3
8
×100
17-17×
17
18
(1)(
2
71
+
1
69
)×23+
25
71

=
2
71
×
23+
1
69
×
23+
25
71

=(
46
71
+
25
71
+
1
3

=1+
1
3

=1
1
3

(2)2÷7×
2
7

=2×
1
7
×
2
7

=
4
49

(3)
3
5
+
2
5
-
3
5
+
2
5

=(
3
5
-
3
5
)+(
2
5
+
2
5
),
=
4
5

(4)
1
2
×
1
3
+
1
2
×
1
3

=
1
2
×
1
3
×2,
=
1
3

(5)
5
8
×98+
3
8
×100,
=
5
8
×
(100-2)+
3
8
×100,
=
5
8
×
100-
5
8
×
2+
3
8
×
100,
=(
5
8
+
3
8
)×100-
5
4

=100-
5
4

=98
3
4

(6)17-17×
17
18

=(1-
17
18
)×17,
=
1
18
×
17,
=
17
18
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