题目内容

5-(6
5
6
-5
1
3
)×
10
21
-
2
7
(4-3.5×
2
3
)÷1
1
9
[10-(1.2-
2
3
)×4.5]÷1
7
12
(1
5
7
+1.25
÷
1
7
+2.05.
(1)5-(6
5
6
-5
1
3
)×
10
21
-
2
7

=5-
3
2
×
10
21
-
2
7

=5-
5
7
-
2
7

=5-(
5
7
+
2
7
),
=5-1,
=4;

(2)(4-3.5×
2
3
)÷1
1
9

=(4-
7
3
)÷1
1
9

=
5
3
÷1
1
9

=
3
2


(3)[10-(1.2-
2
3
)×4.5]÷1
7
12

=[10-
8
15
×4.5]÷1
7
12

=[10-2.4]÷1
7
12

=7.6÷1
7
12

=4.8;

(4)(1
5
7
+1.25
÷
1
7
+2.05,
=
83
28
÷
1
7
+2.05,
=
83
4
+2.05,
=22.8.
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