(1)0.75×99+0.75
=0.75×(99+1),
=75;
(2)
-(5 6
-2 3
)1 6
=
+5 6
-1 6
,2 3
=
;1 3
(3)(8.5-4)×(0.32÷1.6)
=4.5×0.2,
=0.9;
(4)
×[1÷(5 6
?7 8
)]3 4
=
×[1÷5 6
],1 8
=
×8,5 6
=
;20 3
(5)0.925×17+9.25×8.3
=9.25×1.7+9.25×8.3,
=9.25×(1.7+8.3),
=9.25×10,
=92.5;
(6)
×7 15
+8 9
×8 15
2 9
=
×8 15
+7 9
×8 15
,2 9
=
×(8 15
+7 9
),2 9
=
.8 15