9 класс. Срочно.
[tex]5x {}^{2} - 7 \frac{1}{6} x + 2 \frac{1}{2} = 0[/tex]
[tex]5x {}^{2} - 7 \frac{1}{6} x + 2 \frac{1}{2} = 0[/tex]
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5х²-7_1/6х+2½=0
5х²-43/6х+5/2=0
5х²*6-43/6х*6+5/2*6=0
30х²-43х+15=0
D=(-43)²-4*30*15=1849-1800=49
х1=(43-7)/60=0,6
х2=(43+7)/60=5/6
Ответ : 0,6 ; 5/6 .
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