三道小学数学简便计算题! 麻烦大家了!谢谢谢谢谢谢感激不尽! 一定采纳!
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1.=251×[1/(2008×2009)+1/(2009×2010)]
=251×[1/2008-1/2009+1/2009-1/2010]
=251×1/(1004×2010)
=1/(8040)
2.=2008+2008^2-1/2008×2009-1
=2008×(2008+1)-1/2008×2009-1
=2008×2009-1/2008×2009-1
=1
3.=1/2x3/2x2/3x3/4x4/3x....x98/99x100/99
=1/2x1x1x....x1x100/99
=50/99
有问题请追问!祝学习进步!
=251×[1/2008-1/2009+1/2009-1/2010]
=251×1/(1004×2010)
=1/(8040)
2.=2008+2008^2-1/2008×2009-1
=2008×(2008+1)-1/2008×2009-1
=2008×2009-1/2008×2009-1
=1
3.=1/2x3/2x2/3x3/4x4/3x....x98/99x100/99
=1/2x1x1x....x1x100/99
=50/99
有问题请追问!祝学习进步!
追问
都确定吗
追答
你要是不确定的话,可以在计算器一个一个按出来。。只不过最后一个费一点时间罢了
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