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bigfanatka
@bigfanatka
July 2022
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расстояния между точками А (1,2) и В (k,5) равно 5 при k равном:
а) 5
б) 17
в) 1
г) 6
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Answers & Comments
Lesben
A(1,2),B(k,5)
/AB/=5
/AB/=√((k-1)²+(5-2)²)=√(k²-2k+1+9)=√(k²-2k+10)
√(k²-2k+10)=5
k²-2k+10=25
k²-2k-15=0
D=4+60=64, √D=√64=8
k1=(2+8)/2=10/2=5
k2=(2-8)/2=-6/2=-3
2 votes
Thanks 2
Lesben
Otvet na dannoj voproc ect a)5, no -3 tože icpolnajet .
Lesben
Icpolnajet yclovia zadači.
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Answers & Comments
/AB/=5
/AB/=√((k-1)²+(5-2)²)=√(k²-2k+1+9)=√(k²-2k+10)
√(k²-2k+10)=5
k²-2k+10=25
k²-2k-15=0
D=4+60=64, √D=√64=8
k1=(2+8)/2=10/2=5
k2=(2-8)/2=-6/2=-3