Cho \(A = 3{{\rm{x}}^3}{y^2} + 2{{\rm{x}}^2}y - xy...

Câu hỏi: Cho $A = 3{{\rm{x}}^3}{y^2} + 2{{\rm{x}}^2}y - xy,B = 4xy - 3{{\rm{x}}^2}y + 2{{\rm{x}}^3}{y^2} + {y^2}$. Tính A - B

A. ${x^3}{y^2} + 5{{\rm{x}}^2}y - 5{\rm{x}}y - {y^3}$

B. ${2x^3}{y^2} + 5{{\rm{x}}^2}y - 5{\rm{x}}y - {y^2}$

C. ${x^3}{y^2} + 5{{\rm{x}}^2}y - 5{\rm{x}}y - {y^2}$

D. ${x^3}{y^2} + 5{{\rm{x}}^2}y + 5{\rm{x}}y - {y^2}$