a) (2x+1)^2-2(2x+1)(2x-1)+(2x-1)^2
=(2x+1-2x+1)^2
=2^2=4
b)\(\left(2x^3-3x^2+6x-9\right)\left(2x-3\right)\)
\(=\left[x^2\left(2x-3\right)+x\left(2x-3\right)\right]\left(2x-3\right)\)
\(=\left(2x-3\right)\left(x^2+x\right)\left(2x-3\right)\)
\(=\left(2x-3\right)^2\left(x^2+x\right)\)
tự làm tiếp đi nha
tiếp câu b)
=x(2x-3)(x+1)
a, \(\left(2x+1\right)^2+\left(2x-1\right)^2-2\left(2x+1\right)\left(2x-1\right)\)
\(=\left(2x+1\right)^2-2\left(2x+1\right)\left(2x-1\right)+\left(2x-1\right)^2\)
\(=\left[2x+1-\left(2x-1\right)\right]^2\)
\(=\left(2x+1-2x+1\right)^2=2^2=4\)