Ответы на вопрос:
y=0.2x²-3x+12
хв=-b/2a
хв=3/2*0.2=7.5
ув=0.2*7.5²-3*7.5+12=0.2*56.25-22.5+12=11.25-22.5+12=0.75
(7.5;0.75)
1) 5х² +х-4=0 d=1²-4·5·(-4)=81 = = = =0,8 = =- =-1 2) +х-1=0 d= 1²-4·20-1=8 1 = = = = = = =- 3) +10х+3=0 d=10²-4·8·3=4 = = =- =-0,5 = =- =- =-0,75 4)-6х²+7х-2=0 | ÷(-1) 6х²-7х+2=0 d=(-7)²-4·6·2=49-48=1 = = = =0,5 = = =
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