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Chymyrov
@Chymyrov
July 2022
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a)2x^2-7x-9<0
б)x^2-49>0
в)4x^2-x+1>0
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Answers & Comments
baibol29
А. 2х^2-7х-9=0
D=(-7)^2-4×2×(-9)=49-(-72)=121
x'=(9+11)/2=10
×"=(9-11)/2=-1
б.х^2-49=0
х^2=49
х=7
в. 4х^2-х+1=0
D=(1)^2-4×4×1=1-16=-15 (ответ не имеет)
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Answers & Comments
D=(-7)^2-4×2×(-9)=49-(-72)=121
x'=(9+11)/2=10
×"=(9-11)/2=-1
б.х^2-49=0
х^2=49
х=7
в. 4х^2-х+1=0
D=(1)^2-4×4×1=1-16=-15 (ответ не имеет)