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2. -5xy^4 / -xy^3= -5y (×y^3)/-×y^3= -5y
3. 36×^3-6×^2 / 6× = 6×( 6×^2 - ×) / 6×= 6×^2-×
4. 8a^3b^2-4a^2b-2ab^4= 2b
5. 18×^2y^3z -