问题
解答题
|
答案
(1)(
+3 4
)×24,5 6
=
×24+3 4
×24,5 6
=18+20,
=38;
(2)
×13 15
+8 9
×8 9
,2 15
=(
+13 15
)×2 15
,8 9
=
;8 9
(3)
×25-11 12
,11 12
=
×(25-1),11 12
=
×24,11 12
=22;
(4)85×
,5 84
=(84+1)×
,5 84
=84×
+1×5 84
,5 84
=5+
,5 84
=5
.5 84