Предмет: Математика, автор: Hubini

Розв'яжіть нерівності:

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Ответы

Автор ответа: svetlanavaslarionova

Ответ:

2)х²-10х+16>=0; D=100-64=36; x1=(10-6)/2=2;x2=(10+6)/2=8

Ответ:(-беск.;2];[8;+беск.)

3)-х²+0,8х+2,4>0; D=0,64+9,6=10,24; x1=(-0,8-3,2)/-2=-4/(-2)=2

x2=(-0,8+3,2)/2=2,4/2=1,2

Ответ:(1,2;2)

4)5х²-4х-12<=0; D=16+240=256

x1=(4-16)/10=-2,2; x2=(4+16)/10=2

Ответ:[-2,2;2]

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