matematykaszkolna.pl
Rafał: log1/2x-log1/2(x+2)>2
5 lis 16:51
Mycha: log1/2(x/(x+2))>log1/21/4 zał: x>0 wnioskujac x+2>0 x>-2 x/(x+2)<1/4 x(x+2)<1/4(x2+2x+4) x2+2x<1/4x2+1/2x+1 3/4x2+3/2x-1<0 3x2+6x-4<0 Δ=36+48 Δ=84 Δ=221 x1= -1-1/321 x2= -1+1/321 x∈(-1-1/321; -1+1/321) x>0 x∈(0;-1+1/321)
5 lis 17:01