16^(-3/4)+198^(lg1)+log0.5 4+2lg根号2+1/2 lg25
=(2^4)^(-3/4)+198^0+log1/2 (1/2)^(-2)+lg2+lg5
=1/8+1-2+1
=1/8
计算16^(-3/4)+198^(lg1)+log0.5 4+2lg根号2+1/2 lg25
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