题目内容

计算.
(1)
7
8
-(
1
2
+
3
5
)×
5
11

(2)3.68×[1÷(2.1-2.09)]
(3)7.8÷[32×(1-
5
8
)+3.6].
(1)
7
8
-(
1
2
+
3
5
)×
5
11

=
7
8
-
11
10
×
5
11

=
7
8
-
1
2

=
3
8


(2)3.68×[1÷(2.1-2.09)],
=3.68×[1÷0.01],
=3.68×100,
=368;

(3)7.8÷[32×(1-
5
8
)+3.6],
=7.8÷[32×
3
8
+3.6],
=7.8÷[12+3.6],
=7.8÷15.6,
=0.5.
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