1. 3x²-10x+3≤0
Δ=100-4*12=52
√Δ=2√13
x₁=(10-2√13)/6
x₂=(10+2√13)/6
x₁=(5-√13)/3
x₂=(5+√13)/3
x∈<-5+√13;5-√13>
2.
x,y,19
układ równań:
x+2r=19
2x+r=8
x=19-2r
2(19-2r)+r=8
38-4r+r=8
30=3r
r=10
2x+10=8
2x=-2
x=-1
y=x+r=-1+10=9
y=9
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1. 3x²-10x+3≤0
Δ=100-4*12=52
√Δ=2√13
x₁=(10-2√13)/6
x₂=(10+2√13)/6
x₁=(5-√13)/3
x₂=(5+√13)/3
x∈<-5+√13;5-√13>
2.
x,y,19
układ równań:
x+2r=19
2x+r=8
x=19-2r
2x+r=8
2(19-2r)+r=8
38-4r+r=8
30=3r
r=10
2x+r=8
2x+10=8
2x=-2
x=-1
y=x+r=-1+10=9
x=-1
y=9