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Weirdy
@Weirdy
August 2022
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Решите систему уравнений:
{x+y+xy=-7
{(x-y)^2+x+y=22
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iosiffinikov
4х+4у+4ху=-28х*х-2ху+у*у+х+у=22(х+у)^2+5(x+y)=-4Обозначим (х+у)=аа*а+5а+6,25=2,25(а+2,5)*(а+2,5)=1,5*1,5а1=-1 а2=-41)(х-у)^2=23 x-y=sqrt(23) x-y =-sqrt(23)x1=0,5(-1+sqrt(23)) y1=(-1-sqrt(23))*0,5x2=(-1-sqrt(23))*0,5 y2=0,5(-1+sqrt(23)) 2) (x-y)^2=26x3=0,5(-1+sqrt(26)) y3=(-1-sqrt(26))*0,5x4=(-1-sqrt(26))*0,5 y4=0,5(-1+sqrt(26))
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