计算下列各题:(1)8+(?14)?5?(?0.25); (2)(?24)×[712?56+23];(3)[?123] +[?72] ÷[?54];...

2025-05-03 11:36:41
推荐回答(1个)
回答(1):


(1)原式=8?

1
4
?5+0.25
=3;
(2)解法一:原式=(?24)×
7
12
?24×(?
5
6
)?24×
2
3

=14+20-16
=-10 
解法二:原式=(?24)×[
7
12
?
10
12
+
8
12
]

=(?24)×
5
12

=-10
(3)解法一:原式=[?
5
3
]×[?
7
2
]÷[?
5
4
]

=[?
5
3
]×[?
7
2
]×[?
5
4
]

=?
14
3

解法二:原式=?
5
3
×
7
2
×
4
5

=?
14
3

(4)原式=?8÷
4
9
?9×
25
9

=-18-25
=-43.