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artemenko99
@artemenko99
July 2022
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Помогите решить пожалуйстааа
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rigina649
1) у=5-х
х²-х(5-х)+(5-х)²=13
х²-5х+х²+25-10х+х²=13
3х²-15х+12=0
Д=(-15)²-4*3*12=81
х1=15+√81/2*3=15+9/6=4
х2=15-√81/2*3=15-9/6=1
у1=5-4=1
у2=5-1=4
2) у+ху=2х-14
у(1+х)=2х-14
у=2х-14/1+х
подставляем:
х+2(2х-14/1+х)+х(2х-14/1+х)=-7
х(1+х)+4х-28+2х²-14х+7(1+х)=0
х+х²+4х-28+2х²-14х+7+7х=0
3х²-2х-21=0
Д=(-2)-4*3*(-21)=256
х1=2+√256/2*3=2+16/2*3=3
х2=2-√256/2*3=2-16/2*3=-7/3
у1=2*3-14/1+3=-2
у2=2*(-7/3)-14/1-(7/3)=14
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Answers & Comments
х²-х(5-х)+(5-х)²=13
х²-5х+х²+25-10х+х²=13
3х²-15х+12=0
Д=(-15)²-4*3*12=81
х1=15+√81/2*3=15+9/6=4
х2=15-√81/2*3=15-9/6=1
у1=5-4=1
у2=5-1=4
2) у+ху=2х-14
у(1+х)=2х-14
у=2х-14/1+х
подставляем:
х+2(2х-14/1+х)+х(2х-14/1+х)=-7
х(1+х)+4х-28+2х²-14х+7(1+х)=0
х+х²+4х-28+2х²-14х+7+7х=0
3х²-2х-21=0
Д=(-2)-4*3*(-21)=256
х1=2+√256/2*3=2+16/2*3=3
х2=2-√256/2*3=2-16/2*3=-7/3
у1=2*3-14/1+3=-2
у2=2*(-7/3)-14/1-(7/3)=14