已知a^2=4^b=2^8,求(1/2a+1/4b)(1/2a-1/4b)-(1/2a-1/4b)的值十万火急!!!!!!!!!!!!!

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已知a^2=4^b=2^8,求(1/2a+1/4b)(1/2a-1/4b)-(1/2a-1/4b)的值十万火急!!!!!!!!!!!!!

已知a^2=4^b=2^8,求(1/2a+1/4b)(1/2a-1/4b)-(1/2a-1/4b)的值十万火急!!!!!!!!!!!!!
已知a^2=4^b=2^8,求(1/2a+1/4b)(1/2a-1/4b)-(1/2a-1/4b)的值
十万火急!!!!!!!!!!!!!

已知a^2=4^b=2^8,求(1/2a+1/4b)(1/2a-1/4b)-(1/2a-1/4b)的值十万火急!!!!!!!!!!!!!