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(2^4*9^4)/6^4=(2*9)^4/6^4=18^4/6^4=(3*6)^4/6^4=3^4*6^4/6^4=3^4=81
3^2*(4^4:2^5)=3^2*[(2^2)^4:2^5]=3^2*(2^8:2^5)=3^2*2^(8-5)=3^2*2^3=81*8=648
(2^5*5^3)/200=(2^5*5^3)/2*100=(2^5*5^3)/2*10^2=2^5*5^3/2*(2*5)^2=
=(2^5*5^3/2*2^2*5^2=(2^5*5^3)/2^3*5^2=2^2*5=4*5=20
(17^5*3^7)/3^6*17^4=17^(5-4)*3^(7-6)=17*3=51