Quy đồng A, 5/3x;-4x/2 B,5/4x^2;-2/2x^3 C,7x/4a;84/2b D,b/6a;4/18ab;x/9b E,7/30x^3y^3;6/5x^4y^2;13/6x^2y^3

Quy đồng A, 5/3x;-4x/2 B,5/4x^2;-2/2x^3 C,7x/4a;84/2b D,b/6a;4/18ab;x/9b E,7/30x^3y^3;6/5x^4y^2;13/6x^2y^3
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