①loga2+loga1/2=log(a)2+log(a)2^(-1)=log(a)2-log(a)2=0②log3(18)-log3(2)=log(3)(2*9)-log(3)2=log(3)2+log(3)9-log3(2)=log(3)9=log(3)3^2=2log(3)3=2③1g1/4-1g25=lg2^(-2)-lg5^2=-21g2-2lg5=-2*(lg2+lg5)=-2*...
①loga2+loga1/2(a>0,且a≠1) ②log3(18)-log3(2) ③1g1/4-1g25
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