0 = 2 25 − 9 5 x + 2 x 2 {\displaystyle 0={\frac {2}{25}}-{\frac {9}{5}}x+2x^{2}}
Δ = ( 9 5 ) 2 − 4 ∗ 2 ∗ 2 25 {\displaystyle \Delta =({\frac {9}{5}})^{2}-4*2*{\frac {2}{25}}}
Δ = 81 25 − 16 25 = 65 25 = 2 15 25 {\displaystyle \Delta ={\frac {81}{25}}-{\frac {16}{25}}={\frac {65}{25}}=2{\frac {15}{25}}}
x 1 = 9 5 − 13 5 4 = 9 − 65 5 4 = 9 − 65 20 {\displaystyle x_{1}={\frac {{\frac {9}{5}}-{\frac {\sqrt {13}}{\sqrt {5}}}}{4}}={\frac {\frac {9-{\sqrt {65}}}{5}}{4}}={\frac {9-{\sqrt {65}}}{20}}}
0 = 0 , 08 − 1 , 8 x + 2 x 2 {\displaystyle 0=0,08-1,8x+2x^{2}}
Δ = 1 , 8 2 − 4 ∗ 2 ∗ 0 , 08 {\displaystyle \Delta =1,8^{2}-4*2*0,08}
Δ = 3 , 24 − 0 , 64 = 2 , 6 {\displaystyle \Delta =3,24-0,64=2,6}
Δ = 1 , 61245 {\displaystyle {\sqrt {\Delta }}=1,61245}
x 1 = 1 , 8 − 1 , 61245 4 = 0 , 18755 4 = 0 , 04689 {\displaystyle x_{1}={\frac {1,8-1,61245}{4}}={\frac {0,18755}{4}}=0,04689}
c ∧ ( a ∨ b ) {\displaystyle c\land (a\lor b)}
