计算,1/2x4+1/4x6+1/6x8+.+1/48x50=?,1/2+1/6+1/12+1/20+1/30+1/42
来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/10/04 10:32:01
计算,1/2x4+1/4x6+1/6x8+.+1/48x50=?,1/2+1/6+1/12+1/20+1/30+1/42=?
计算,
1/2x4+1/4x6+1/6x8+.+1/48x50
=1/2×(1/2-1/4+1/4-1/6+1/6-1/8+……+1/48-1/50)
=1/2×(1/2-1/50)
=1/2×12/25
=6/25,
1/2+1/6+1/12+1/20+1/30+1/42
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=1-1/7
=6/7
1/2x4+1/4x6+1/6x8+.+1/48x50
=1/2×(1/2-1/4+1/4-1/6+1/6-1/8+……+1/48-1/50)
=1/2×(1/2-1/50)
=1/2×12/25
=6/25,
1/2+1/6+1/12+1/20+1/30+1/42
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=1-1/7
=6/7
1x2+2x4+3x6+4x8 ------------------------------- 2x3+4x6+6x9+
1x2+2x4+3x6+4x8+5x10+.+20x40 简便计算
探究并计算:1/2x4+1/4x6+1/6x8+…+1/2012x2014
(1x2+2x4+3x6+4x8)/(2x3+4x6+6x9+8x12)
1/2x4+1/4x6+1/6x8+…+1/2010x2012 怎么算!
1/2x4+1/4x6+1/6x8+.+1/2010x2012
1x2+2x4+3x6+4x8+5x10+.+20x40 怎么算?
2X4分之一+4X6分之一+6X8分之一+…+2010X2012分之一= n(n+1)分之一=
x8+x7+x6+x5+x4+x3+x2+x+1因式分解
1x2/1+2x3/1+3x4/1+.+2009x2010/1=? 2x4/1+4x6/1+6x8/1+.+2010x2
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计算:1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9+1/9x10.