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(-1/4)^2009 * 4^2010 =[(-1/4)*4]^2009 * 4 =[-1]^2009 * 4 =-1*4 =-4
3的18次方乘以負9分之1的8次方 =3的18次方×(3分之1)的16次方 =3²×3的16次方×(3分之1)的16次方 =9×(3×3分之1)的16次方 =9×1 =9
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