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40x²y^6z⁴+8x⁴y³z⁴/
2x^5y4z+20x³y^7z+50xy^10z

(40x²y⁶z⁴+8x⁴y³z⁴)/(2x⁵y⁴z+20x³y⁷z+50xy¹⁰z)=8x²y³z⁴(5y³+x²)/(2xy⁴z(x⁴+10x²y³+25y⁶))=4xz³(5y³+x²)/(y(x²+5y³)²)=4xz³/(y(x²+5y³))