问题
解答题
用简便方法计算下面各题.
(
|
答案
(1)
×17 12
×5 34
,3 4
=
;5 32
(2)
×72-5 7
×23,5 7
=
×(72-23),5 7
=
×49,5 7
=35;
(3)
+14 17
×16,14 17
=
×(1+16),14 17
=14;
(4)(
+1 4
)×24,1 6
=
×24+1 4
×24,1 6
=6+4,
=10;
(5)
×5×1 8
,8 9
=
;5 9
(6)
×3+6 5
×6+6 5
,6 5
=
×(3+6+1),6 5
=
×10,6 5
=12.