(25x^2+15x^3y-20x^4)除以(-5x^2)
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(25x^2+15x^3y-20x^4)除以(-5x^2)(25x^2+15x^3y-20x^4)除以(-5x^2)(25x^2+15x^3y-20x^4)除以(-5x^2)(25x^2+15x^3y
(25x^2+15x^3y-20x^4)除以(-5x^2)
(25x^2+15x^3y-20x^4)除以(-5x^2)
(25x^2+15x^3y-20x^4)除以(-5x^2)
(25x^2+15x^3y-20x^4)除以(-5x^2)
=5x^2(5+3xy-4x^2)÷(-5x^2)
=-(5+3xy-4x^2)
=-5-3xy+4x^2