用2009×2010-1/2009+2008×2010这个分数来乘2010的答案是多少.要用简便计算!
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用2009×2010-1/2009+2008×2010这个分数来乘2010的答案是多少.要用简便计算!
用2009×2010-1/2009+2008×2010这个分数来乘2010的答案是多少.要用简便计算!
用2009×2010-1/2009+2008×2010这个分数来乘2010的答案是多少.要用简便计算!
because:2008x2010=2009x2009-1 so:(2009x2010-1)x2010/(2009+2008x2010) =(2009x2010-1)x2010/(2009+2009x2009-1) =2010