下列各题,怎样算简便就怎样算.(1)4.85×0.17+0.485×8.3(2)314+47×99+51
下列各题,怎样算简便就怎样算.(1)4.85×0.17+0.485×8.3(2)314+47×99+514(3)2008×20072009(4)216-2.86×(6.2...
下列各题,怎样算简便就怎样算.(1)4.85×0.17+0.485×8.3(2)314+47×99+514(3)2008×20072009(4)216-2.86×(6.25-614)
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2015-02-08
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(1)4.85×0.17+0.485×8.3
=0.485×1.7+0.485×8.3,
=(1.7+8.3)×0.485,
=10×0.485,
=4.85;
(2)
+
×99+
=
+
×(100-1)+
,
=
+
+
×100-
×1,
=
+
?,
=
?+
,
=
;
(3)2008×
=(2009-1)×
,
=2009×
-
×1,
=2007-
,
=2006
;
(4)2
-2.86×(6.25-6
)
=
2-2.86×(6.25-6.25),
=2
-2.86×0,
=
2-0,
=2
.
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