Thực hiện các phép tính sau:
a) \(\left( {x - 3} \right)\left( {2x + 5} \right)\)
b) \(\left( {9{x^2}{y^3} + 18{x^2}{y^2} - 3x{y^2}} \right):9x{y^2}\)
A.\(\begin{array}{l}{\rm{a)}}\,\,2{x^2} - x - 15\\{\rm{b)}}\,\,3xy + 6x - 1\end{array}\)
B.\(\begin{array}{l}{\rm{a)}}\,\,2{x^2} - x - 15\\{\rm{b)}}\,\,\frac{{3xy + 6x - 1}}{3}\end{array}\)
C.\(\begin{array}{l}{\rm{a)}}\,\,2{x^2} - x + 15\\{\rm{b)}}\,\,\frac{{3xy - 6x + 1}}{3}\end{array}\)
D.\(\begin{array}{l}{\rm{a)}}\,\,2{x^2} - x + 15\\{\rm{b)}}\,\,3xy - 6x + 1\end{array}\)
a) \(\left( {x - 3} \right)\left( {2x + 5} \right)\)
b) \(\left( {9{x^2}{y^3} + 18{x^2}{y^2} - 3x{y^2}} \right):9x{y^2}\)
A.\(\begin{array}{l}{\rm{a)}}\,\,2{x^2} - x - 15\\{\rm{b)}}\,\,3xy + 6x - 1\end{array}\)
B.\(\begin{array}{l}{\rm{a)}}\,\,2{x^2} - x - 15\\{\rm{b)}}\,\,\frac{{3xy + 6x - 1}}{3}\end{array}\)
C.\(\begin{array}{l}{\rm{a)}}\,\,2{x^2} - x + 15\\{\rm{b)}}\,\,\frac{{3xy - 6x + 1}}{3}\end{array}\)
D.\(\begin{array}{l}{\rm{a)}}\,\,2{x^2} - x + 15\\{\rm{b)}}\,\,3xy - 6x + 1\end{array}\)
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Hóa Học lớp 12
