求:-2×2008×2011009+3×2009×2010008的答案及过程。 急急急急急!!!!!!!!!
1个回答
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-2×2008×2011009+3×2009×2010008
=3×(2008+1)×2010008-2×2008×2011009
=3×2008×2010008+3×2010008-2×2008×2011009
=2008×(3×2010008-2×2010009)+3×2010008
=2008×[3×(2010009-1)-2×2010009]+3×2010008
=2008×(3×2010009-3-2×2010009)+3×2010008
=2008×2010006+3×2010008
=2008×2010006+3×(2010006+2)
=2008×2010006+3×2010006+6
=2011×2010006+6
=4042122066+6
=4042122072
=3×(2008+1)×2010008-2×2008×2011009
=3×2008×2010008+3×2010008-2×2008×2011009
=2008×(3×2010008-2×2010009)+3×2010008
=2008×[3×(2010009-1)-2×2010009]+3×2010008
=2008×(3×2010009-3-2×2010009)+3×2010008
=2008×2010006+3×2010008
=2008×2010006+3×(2010006+2)
=2008×2010006+3×2010006+6
=2011×2010006+6
=4042122066+6
=4042122072
追问
告诉你一个遗憾的消息,你答错了,老师今天讲了这道题,答案是4038106072
追答
啊啊我知道了- -
第三行是2011009,第四行抄下来就变成2010009了……我去面壁……
从第4行开始更正如下:
=2008×(3×2010008-2×2011009)+3×2010008
=2008×[3×(2011009-1001)-2×2011009]+3×2010008
=2008×[3×2011009-3003-2×2011009]+3×2010008
=2008×2008006+3×2010008
=2008×2008006+3×(2008006+2002)
=2008006×(2008+3)+6006
=2008006×2011+60006
=4038100066+6006
=4038106072
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