(1)(8.8-23.4×
)÷1 3
,5 9
=(8.8-7.8)÷
,5 9
=1×
,9 5
=1
;4 5
(2)64×12.5×2.5,
=(8×12.5)×(2.5×8),
=100×20,
=2000;
(3)5.526-4.84+4.474-3.16,
=(5.526+4.474)-(4.84+3.16),
=10-8,
=2;
(4)24×(
+1 3
-5 6
),3 4
=24×
+24×1 3
?24×5 6
,3 4
=8+20-18,
=10.