问题
解答题
|
答案
①2.5×1.25×32,
=2.5×1.25×4×8,
=(2.5×4)×(1.25×8),
=10×10,
=100;
②
×5 11
+2 7
×6 7
,2 11
=
×5 11
+2 7
×2 7
,6 11
=(
+5 11
)×6 11
,2 7
=1×
,2 7
=
;2 7
③
×2008,2006 2007
=
×(2007+1),2006 2007
=
×2007+2006 2007
×1,2006 2007
=2006+
,2006 2007
=2006
.2006 2007