\(B = \left( { - 2\frac{1}{3}{x^2}{y^2}} \right).\frac{9}{{16}}x{y^2}.{\left( { - 2{x^2}y} \right)^3}\)
Đơn thức B sau khi thu gọn là:
A.\(\frac{{-21}}{2}.{x^9}.{y^6}\)
B.\(\frac{{21}}{2}.{x^9}.{y^7}\)
C.\(\frac{{-21}}{2}.{x^7}.{y^9}\)
D.\(\frac{{1}}{2}.{x^9}.{y^7}\)