|
(1)5×6.6+7.5×6.6,
=(5+7.5)×6.6,
=12.5×6.6,
=82.5;
(2)
×24,11 23
=
×(23+1),11 23
=
×23+11 23
×1,11 23
=11+
,11 23
=11
;11 23
(3)24×(
-2 3
+1 4
),5 12
=24×
-24×2 3
+24×1 4
,5 12
=16-6+10,
=20;
(4)
÷3.25+1 15
,8 13
=
÷31 15
+1 4
,8 13
=
×1 15
+4 13
,8 13
=
+4 195
,8 13
=
+4 195
,120 195
=
;124 195
(5)
+3 15
÷3.75,4 13
=
+3 15
÷34 13
,3 4
=
+3 15
×4 13
,4 15
=
+3 15
,16 195
=
+39 195
,16 195
=
,55 195
=
.11 39