(1)原式=8?
?5+0.251 4
=3;
(2)解法一:原式=(?24)×
?24×(?7 12
)?24×5 6
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÷
?9×4 9
25 9
=-18-25
=-43.