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1，已知f(x)=a~x-1/2，f(lga)=√10，求a。（安徽省教材编审室）2，设a，b，c是不等于0的实数，试解方程组：
1, known f (x) = a ~ x-1/2, f (lga) = √ 10, seeking a. (Anhui Provincial Textbook Editing Office) 2. Let a, b, c be real numbers not equal to 0. Try to solve the equations: