①2008×2010×(12008×2009+12009×2010)
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/06/04 14:50:32
①2008×2010×(
+
1 |
2008×2009 |
1 |
2009×2010 |
①2008×2010×(
1
2008×2009+
1
2009×2010)
=2008×2010×
1
2008×2009+2008×2010×
1
2009×2010,
=
2010
2009+
2008
2009,
=
4018
2009,
=2.
②2000×20102010-2010×20002000
=2000×2010×10001-2010×2000×10001,
=0;
③
9
15×
14
17+
8
17×
14
15
=
9
15×
14
17+
1
17×14(
1
15×8),
=
9
15×
4
17+
14
17×
8
15,
=(
9
15+
8
15)×
14
17,
=
17
15×
14
17,
=
14
15;
④1×2+2×3+3×4+4×5+…+18×19+19×20
=12+1+22+2+32+3+…+192+19
=12+22+32+…+192+1+2+…+19,
=19×(19+1)×(19×2+1)÷6+(19+1)×19÷2,
=19×20×39÷6+20×19÷2,
=2470+190,
=2660.
1
2008×2009+
1
2009×2010)
=2008×2010×
1
2008×2009+2008×2010×
1
2009×2010,
=
2010
2009+
2008
2009,
=
4018
2009,
=2.
②2000×20102010-2010×20002000
=2000×2010×10001-2010×2000×10001,
=0;
③
9
15×
14
17+
8
17×
14
15
=
9
15×
14
17+
1
17×14(
1
15×8),
=
9
15×
4
17+
14
17×
8
15,
=(
9
15+
8
15)×
14
17,
=
17
15×
14
17,
=
14
15;
④1×2+2×3+3×4+4×5+…+18×19+19×20
=12+1+22+2+32+3+…+192+19
=12+22+32+…+192+1+2+…+19,
=19×(19+1)×(19×2+1)÷6+(19+1)×19÷2,
=19×20×39÷6+20×19÷2,
=2470+190,
=2660.
①2008×2010×(12008×2009+12009×2010)
(2008+2009*2006)/(2008*2009-2010
计算|12009−12008
简便计算2010/(2008+2008/2009)
(2009+2008*2010)/(2009*2010-1)+(2010+2009*2011)/(2010*2011-1
计算(2008-2009)^2010+(2007-2008)^2009=
奥数题(2010+1/2009)除以(2009+1/2010)+(2008+1/2009)除以(2009+1/2008)
2010*2008/2009
2010*2009分之2008
①(2002+2003+2004+2005+2006+2007+2008+2009+2010)÷2006
计算 (-2010)乘以2008/2009
(2010+1/2009)/(2009+1/2010)+(2008+1/2009)/(2009+1