I can help my community : I provide education for many poor people and eledry people.I still plant more trees for my community beautiful.

<=>\(x^2+2x-1x-2<0\)

=>\(x^2+1x<2\)

=>\(x\left(x+1\right)<2\)

=>\(x\in\){các số nhỏ hơn 0}

c nhé đúng cho mình 1 tick

friendly