Đáp án:
\(\begin{array}{l}
a) - 3{x^3}{y^4}\\
b) - \dfrac{2}{{27}}x{y^2}{z^6}\\
c) - \dfrac{9}{2}{x^8}{y^5}\\
d)\dfrac{3}{2}{x^5}{y^3}
\end{array}\)
Giải thích các bước giải:
\(\begin{array}{l}
a) - \dfrac{1}{2}xy.6{x^2}{y^3}\\
= - 3{x^3}{y^4}\\
\to HS: - 3\\
Bậc:3 + 4 = 7\\
b) - \dfrac{2}{3}x.\dfrac{1}{9}.{y^2}.{z^{3.2}}\\
= - \dfrac{2}{{27}}x{y^2}{z^6}\\
\to HS: - \dfrac{2}{{27}}\\
Bậc:1 + 2 + 6 = 9\\
c) - 2{x^2}y.\dfrac{9}{4}{x^2}{y^2}.{x^4}{y^2}\\
= - \dfrac{9}{2}{x^8}{y^5}\\
\to HS: - \dfrac{9}{2}\\
Bậc:8 + 5 = 13\\
d){x^4}.2xy.\dfrac{3}{4}{y^2}\\
= \dfrac{3}{2}{x^5}{y^3}\\
\to HS:\dfrac{3}{2}\\
Bậc:5 + 3 = 8
\end{array}\)
