= (-2/3)^4*(x²)^4*(y²)^4 *(-9/4)³x³(y³)³=(2/3)^4*x^8*y^8*(-9/4)³x³y^9=
=(2/3* -9/4)³*2/3 x^11y^17=(-3/2)³*2/3 x^11y^17=-27/8*2/3x^11y^17=-9/4x^11y^17=-2 1/4x^11y^17
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= (-2/3)^4*(x²)^4*(y²)^4 *(-9/4)³x³(y³)³=(2/3)^4*x^8*y^8*(-9/4)³x³y^9=
=(2/3* -9/4)³*2/3 x^11y^17=(-3/2)³*2/3 x^11y^17=-27/8*2/3x^11y^17=-9/4x^11y^17=-2 1/4x^11y^17