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. \({x^3}{y^2} + 5{{\rm{x}}^2}y + 5{\rm{x}}y - {y^2}\)