(1)80-
×5 4
+40×80%,4 15
=80-
+32,1 3
=111
;2 3
(2)35×75%+66×
?0.75,3 4
=35×0.75+66×0.75-0.75,
=(35+66-1)×0.75,
=100×0.75,
=75;
(3)
÷[4 5
×(1?20%)],5 8
=
÷[4 5
×5 8
],4 5
=
÷4 5
,1 2
=
;8 5
(4)
×27+1 5
×41,3 5
=
×27+1 5
×3×41,1 5
=
×(27+123),1 5
=
×150,1 5
=30.