①(
+1 3
+1 4
)×12,1 6
=
×12+1 3
×12+1 4
×12,1 6
=4+3+2,
=9;
②18.93-6
-35 8
,3 8
=18.93-(6
+35 8
),3 8
=18.93-10,
=8.93;
③163×
-0.75×62-75%,3 4
=163×0.75-0.75×62-0.75,
=(163-62-1)×0.75,
=100×0.75,
=75;
④7
÷5 12
+13 5
×22 3
,7 12
=7
×5 12
+5 3
×25 3
,7 12
=(7
+25 12
)×7 12
,5 3
=10×
,5 3
=
.50 3