(1)12.53-1.35×2-9.3,
=12.53-2.7-9.3,
=12.53-(2.7+9.3),
=12.53-12,
=0.53;
(2)0.8÷(4-3.75)÷0.1,
=0.8÷0.25÷0.1,
=3.2÷0.1,
=32;
(3)
+4 5
+11 15
,3 10
=
+24 30
+22 30
,9 30
=
;11 6
(4)7-(
-3 4
),2 5
=7-
,7 20
=6
;13 20
(5)
+11 12
+5 8
+3 8
,1 12
=(
+11 12
)+(1 12
+5 8
),3 8
=1+1,
=2;
(6)10-
-6 7
,1 7
=10-(
+6 7
),1 7
=10-1,
=9.