(1)1042-384÷16×13
=1024-24×13
=1024-312
=712;
(2)85×0.75+15×75%
=(85+15)×0.75
=100×0.75
=75;
(3)40÷[(
-3 4
)×3]1 3
=40÷[
×3]5 12
=40÷
5 4
=32;
(4)(
+5 8
)×8+1 27
19 27
=
×8+5 8
×8+1 27
19 27
=5+
+8 27
19 27
=5+(
+8 27
)19 27
=5+1
=6.