Bài 2:
\(a,=3xy\left(x-2y\right)\\ b,=2021\left(x-y\right)+\left(x-y\right)\left(x+y\right)=\left(x+y+2021\right)\left(x-y\right)\\ c,=\left(x-5\right)^2-16y^2=\left(x-4y-5\right)\left(x+4y-5\right)\)
Bài 3:
\(a,\Leftrightarrow x^2-6x+9-x^2+4x=5\\ \Leftrightarrow-2x=-4\Leftrightarrow x=2\\ b,\Leftrightarrow4x\left(x+3\right)-5\left(x+3\right)=0\\ \Leftrightarrow\left(x+3\right)\left(4x-5\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=-3\\x=\dfrac{5}{4}\end{matrix}\right.\)
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