问题
解答题
怎样简便就怎样算: 35×1
25
1
(
|
答案
35×1
×33 10 17 21
=35×
×13 10
,80 21
=173
;1 3
25
×425 28
=25×4+
×4,25 28
=100+3
,4 7
=103
;4 7
1
×5.6+5 7 4 5
=
×12 7
+28 5
,4 5
=
+48 5
,4 5
=10
;2 5
(
+2 9
)×272 27
=
×27+2 9
×27,2 27
=6+2,
=8.