若3^m=1/81,(1/2)^n=4,求(1+x^2)^m+n÷(1+x^2)^3n的值 急如果729×9^2=3k,则k等于()A。5 9 C.10 D.11如果(a^n·b^m·b)^3=a^9b^15,那么m、n的值为()A。m=9,n=4 B.m=3,n=4 C.m=4,n=3 D.m=9,n=6(2/3)^2006×(1.5)^2005×(-1)^2000=(-
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