X²-3x-18=0 9x²-24x+16=0 3x²-13x+14=0 5b²-16b+3=0 - вопрос №879962331809241603131405163032109180 от kulmameteva 22.04.2022 07:35

Question

Алгебра: X²-3x-18=0 9x²-24x+16=0 3x²-13x+14=0 5b²-16b+3=0 3x²-21=0 x²+9x+18=0

kulmameteva · Answer

X²-3x -18=0 √D=√9+72=9 x1=1/2[3-9]=-3 x2=1/2[3+9]=6

9x²-24x+16=0 √D=√576-576=0 x=x0=-b/2a=24/18=4/3

3x²-13x+14=0 √D=√169-168=1 x1=1/6[13-1]=2 x2=1/6[13+1]=7/3

5b²-16b+3=0 √D=√256-60=14 x1=1/10[16-14]=0.2 x2=1/10[16+14] =3

3x²-21=0 x²=7 x1=√7 x2=-√7

x²+9x+18=0 √D=√81-72=3 x1=1/2[-9+3]=-3 x2=1/2[-9-3]=-6