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Ответ

Ответ дан
iosiffinikov
1) у=20/х
0,5x^2-80=-18x
x^2+36x=160
x^2+36x+324=484
(x+18)^2=22^2
x1=4
x2=-40
y1=5
y2=-0,5
2)  x+y=5/6 xy
x-y=1
y=x-1
2x-1=5/6x*(x-1)
-1,2+2,4x=x^2-x
x^2-3,4x+1,2=0
(x-1,7)^2=1,3^2
x1=3
x2=0,4
y1=2
y2=-0,6

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