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1) 2b(m n)/6bc(m n) ; 2) (44c^3 d^8 (c-d))/(100c^5 d^4 (c-d) ); 3)(2(m-n))/(a(n-m)); 4) (16〖(x-y)〗^2)/(48〖(y-x)〗^2 )
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