Bài 8 Cho \( B=\left(\frac{\sqrt{x}-2}{x-1}-\frac{\sqrt{x}+2}{x+2 \sqrt{x}+1}\right) \cdot \frac{(1-x)^{2}}{2} \) \( \begin{array}{ll}\text { a) Rút gọn B. CMR: Nếu } 0<x<1 \text { thi } B>\end{array} \) Bài 9. Cho \( C=\left(\begin{array}{cc}1 & 1\end{array}\right) \cdot(\sqrt{a}+1 \) \( \sqrt{a} \)

Simplify the polynomial, then evaluate for \( x=-3 \). \( -x^{2}+2 x-2 x^{2}-3 x+4+x^{2} \)

Subtract: \( \left(12 f^{2}-9 f+15\right)-\left(-4 f^{2}-3 f+6\right) \)

Simplify the following expressions fully: \( 1.2 .1 \quad(x+2)\left(x^{2}-x+3\right) \) \( 1.2 .2 \quad \frac{5}{x+3}-\frac{3}{2-x} \) \( 1.2 .3 \quad \frac{25^{-x} \cdot 15^{x+1}}{3^{x} \cdot 5^{-x}} \)

How many elements are there in a complete solution to \( x^{2}+7 x+2 \equiv 0(\bmod 41) ? \)

1) Solve. \( \begin{array}{l}\text { y }=-4 x-3 \\ y=-5 x-6\end{array} \) \( (\square, \square) \) Submit