Question

bài 1: giải hệ bất phương trình sau:

a) \(\left\{{}\begin{matrix}2-x>0\\2x+1>x-2\end{matrix}\right.\)

b) \(\left\{{}\begin{matrix}3\left(x-6\right)< -3\\\frac{5x+1}{2}>7\end{matrix}\right.\)

c) \(\left\{{}\begin{matrix}\frac{x-2}{x-1}\le0\\\left(x-1\right)\left(x+1\right)\le0\end{matrix}\right.\)

bài 2: xét dấu các nhị thức sau:

a) q(x)=\(\frac{\left(x-1\right)\left(2x-7\right)}{\left(2+x\right)^2}\)

b) n(x)=\(\frac{\left(1-2x\right)\left(2x-1\right)}{3+x}\)

bài 3: giải các bất phương trình sau;

a) 2\(\left|x-3\right|-\left|3x+1\right|\le x+5\)

b) \(\left|\frac{3x+1}{x-3}\right|< 3\)

Answer 1

https://i.imgur.com/SmYpZ8d.jpg

Answer 2

https://i.imgur.com/D95iizc.jpg

Answer 3

https://i.imgur.com/crQ6J91.jpg

Answer 4

https://i.imgur.com/pJqKWql.jpg