问题
解答题
|
答案
(1)
+2 5
×4 5
,7 4
=
+2 5
,7 5
=
;9 5
(2)
×(5 8
+3 4
),9 20
=
×5 8
,24 20
=
;3 4
(3)
×14-12 13
,12 13
=
×(14-1),12 13
=
×13,12 13
=12;
(4)48×(
-5 6
),3 8
=48×
-48×5 6
,3 8
=40-18,
=22;
(5)
+1 4
×3 68
,51 5
=
+1 4
,9 20
=
;7 10
(6)
-9 20
+2 15
,11 20
=
+9 20
-11 20
,2 15
=1-
,2 15
=
.13 15