Question

A = \(1+\frac{3}{m-2}.\sqrt{m^2-4m+4}\)

B = \(\sqrt{1-10x+25x^2}-4x\)

Rút gọn

Answer 1

\(A=1+\frac{3}{m-1}\cdot\sqrt{m^2-4m+4}\)

\(=1+\frac{3}{m-1}\cdot\sqrt{\left(x-2\right)^2}\)

\(=1+\frac{3}{m-1}\cdot\left|x-2\right|\)

\(=\frac{m-1}{m-1}+\frac{3\left(m-2\right)}{m-1}\)

\(=\frac{4m-7}{m-1}\)

Answer 2

\(B=\sqrt{1-10x+25x^2}-4x\)

\(=\sqrt{\left(5x-1\right)^2}-4x\)

\(=\left|5x-1\right|-4x\)

 

Answer 3

b) làm nốt

\(=5x-1-4x=x-1\)