29 tháng 10 2023 lúc 10:05
a) \(\left(x-2\right)^3+2-x\)
\(=\left(x-2\right)^3-\left(x-2\right)\)
\(=\left(x-2\right)\left[\left(x-2\right)^2-1\right]\)
\(=\left(x-2\right)\left(x-2-1\right)\left(x-2+1\right)\)
\(=\left(x-2\right)\left(x-3\right)\left(x-1\right)\)
b) \(ax^2-2bxy+2bx^2-axy\)
\(=\left(a+2b\right)x^2-\left(a+2b\right)xy\)
\(=\left(a+2b\right)\left(x^2-xy\right)\)
\(=x\left(a+2b\right)\left(x-y\right)\)
c) \(x^2-4xy+4y^2-9a^2\)
\(=\left(x^2-4xy+4y^2\right)-9a^2\)
\(=\left(x-2y\right)^2-\left(3a\right)^2\)
\(=\left(x-2y-3a\right)\left(x-2y+3a\right)\)
Đúng 1
Bình luận (0)
