-1/2x^2y-1/3xy^2+1/2yx^2+2/3y^2x-4/5x^2y=(-1/2+1/2-4/5)x²y+(2/3-1/3)xy²=-4/5x²y+1/3xy²=-4/5x(-5)²x(-3)+1/3x(-5)x(-3)²=60-15=45
-1/2x^2y-1/3xy^2+1/2yx^2+2/3y^2x-4/5x^2y
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