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namaka200
@namaka200
July 2022
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Помогите 50 баллов,алгебра 8 класс
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армения20171
1)(х-2)²(х+1)(х-3)³≤0
(х-2)²≥0;х€R
(х+1)(х-3)³≤0
__+__-1__-__3____+____
х€[-1;3]
2)(х+2)³(х-1)(х+3)²≥0
(х+3)²≥0;x€R
(х+2)³(х-1)≥0
_+___-2__-___1_____+____
x€(-oo;-2]U[1;+oo)
3)√(x²-2x-35)
x²-2x-35≥0
D=4+140=144=12²
x=(2±12)/2
x1=7;x2=-5
x€(-oo;-5]U[7;+oo)
4)√(x²+4x-45)
x²+4x-45≥0
D=16+180=196=14²
x=(-4±14)/2
x1=-9;x2=5
x€(-oo;-9]U[5;+oo)
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Answers & Comments
(х-2)²≥0;х€R
(х+1)(х-3)³≤0
__+__-1__-__3____+____
х€[-1;3]
2)(х+2)³(х-1)(х+3)²≥0
(х+3)²≥0;x€R
(х+2)³(х-1)≥0
_+___-2__-___1_____+____
x€(-oo;-2]U[1;+oo)
3)√(x²-2x-35)
x²-2x-35≥0
D=4+140=144=12²
x=(2±12)/2
x1=7;x2=-5
x€(-oo;-5]U[7;+oo)
4)√(x²+4x-45)
x²+4x-45≥0
D=16+180=196=14²
x=(-4±14)/2
x1=-9;x2=5
x€(-oo;-9]U[5;+oo)