Question

Em chỉ cần đáp án thôi ạ

Answer 1

d: \(\left(\dfrac{1}{2}x-1\right)\left(2x-3\right)\)

\(=x^2-\dfrac{3}{2}x-2x+3\)

\(=x^2-\dfrac{7}{2}x+3\)

e: Ta có: \(\left(x-7\right)\left(x-5\right)\)

\(=x^2-5x-7x+35\)

\(=x^2-12x+35\)

f: Ta có: \(\left(x-\dfrac{1}{2}\right)\left(x+\dfrac{1}{2}\right)\left(4x-1\right)\)

\(=4\left(x-\dfrac{1}{4}\right)\left(x-\dfrac{1}{4}\right)\)

\(=4\left(x-\dfrac{1}{4}\right)^2\)

\(=4\left(x^2-\dfrac{1}{2}x+\dfrac{1}{16}\right)\)

\(=4x^2-2x+\dfrac{1}{4}\)