问题 解答题
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].
答案

(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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