问题
解答题
用简便方法计算 511×
2002×
2003×2003-2002×2004 7.24×
|
答案
511×
,373737 737373
=73×7×
,10101×37 10101×73
=259;
2002×
,2000 2001
=(2001+1)×
,2000 2001
=2000
;2000 2001
2003×2003-2002×2004,
=2003×2003-(2003-1)×(2003+1),
=2003×2003-(2003×2003-1),
=2003×2003-2003×2003+1,
=1;
7.24×
+0.6×2.41-0.65×60%,3 5
=7.24×
+3 5
×2.41-0.65×3 5
,3 5
=9×
,3 5
=
.27 5