问题
解答题
2009÷2009
9.81×0.1+0.5×98.1+0.049×981 0.38×7-
（
|
答案
（1）2009÷20092009 2010
=2009÷2009×(2010+1) 2010
=2009×2010 2009×(2010+1)
=
；2010 2011
（2）9.81×0.1+0.5×98.1+0.049×981
=9.81×0.1+5×9.81+4.9×9.81
=9.81×（0.1+5+4.9）
=9.81×10
=98.1；
（3）0.38×7-
+4×19 50 19 50
=
×7-19 50
+4×19 50 19 50
=
×（7-1+4）19 50
=
×1019 50
=
；19 5
（4）（
+1 19
）×23×191 23
=（
×23+1 19
×23）×191 23
=（
+1）×1923 19
=
×19+1923 19
=23+19
=42．