
因式分解(2/5x^3y^2-7xy^2+2/3y^3)/(-2/3y^2)
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[(2/5)*(x^3y^2)-7*(xy^2)+(2/3)*(y^3)]/[(-2/3)*y^2]
(2/5) *(-3/2)*(x^3)- 7*(-3/2)*x+(2/3)*(-3/2)*y
= -(3/5)*x^3 + (21/2)*x - y
(2/5) *(-3/2)*(x^3)- 7*(-3/2)*x+(2/3)*(-3/2)*y
= -(3/5)*x^3 + (21/2)*x - y
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