问题 解答题
计算.
(1)(-24)×(
3
8
-
5
6
)
;  
(2)(-7)×(-
4
3
5
14
;      
(3)-2.1×5.4×(-
1
7
)
答案

(1)(-24)×(

3
8
-
5
6
),

=

3
8
×(-24)-
5
6
×(-24),

=-9+20,

=11;

(2)(-7)×(-

4
3
)×
5
14

=7×

4
3
×
5
14

=

10
3

(3)-2.1×5.4×(-

1
7
),

=2.1×5.4×

1
7

=1.62.

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