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81/16=9/4*9/4=(9/4)2=3/2*3/2*3/2*3/2=(3/2)4
b
16/625=2/5*2/5*2/5*2/5=(2/5)4=4/625*4=(4/25)2
c
256/81=4/3*4/3*4/3*4/3=(4/3)4=16/9*16/9=(16/9)2