1)6x²-17x+12<0<br>D=289-288=1
x1=(17-1)/12=4/3 x2=(17+1)/12=3/2
+ _ +
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4/3 3/2
x∈(4/3;3/2)
2)x²-24<0 (x-2√6)(x+2√6)<0<br>x=2√6 x=-2√6
+ _ +
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-2√6 2√6
x∈(-2√6;2√6)
3)4x²+4x+1<0 (2x+1)²<0-нет решения<br>4)3х²-4x-7<0<br>D=16+84=100
x1=(4-10)/6=-1 x2=(4+10)/6=7/3
+ _ +
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-1 7/3
x∈)-1;7/3)