1). -3x^3y^4*4x^5y^3= (-3)*4*x^3*x^5*y^4*y^3= -12x^8y^7; 2). (-4a^6n)^3= (-4)^3*(a^6)^3*n^3= -64a^18n^3.
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1). -3x^3y^4*4x^5y^3= (-3)*4*x^3*x^5*y^4*y^3= -12x^8y^7; 2). (-4a^6n)^3= (-4)^3*(a^6)^3*n^3= -64a^18n^3.