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49^1/2;49^1/4=49^ (1/2-1/4)=49^ 1/4= (7²)^1/4=7^1/2=√7
√5^5*7^-3/2=√(5²*5²*5) *1/√7³=25√5*1/7√7=25√35/49
9^-3/4*27^-3/2=(3²)^ -3/4*(3³)^-3/2=3^-3/2*3^-9/2=3^[ -3/2-9/2]=3^-6=1/729
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