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2007的2次方-2008*2006+1 =2007^2-(2007+1)(2007-1)+1 =2007^2-(2007^2-1)+1 =2007^2-2007^2+1+1 =2
0.125的2007次方乘以8的2008次方 =(0.125*8)的2007方*8 =8
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