Система уравнений:
0,2х=0,3у
х-у=70
х=70+у
14+0,2у=0,3у; 14=0,1у
У=140
Х=70+140= 210
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5/х-3-8/х - 3=0
5х-8(х-3)-3х(х-3)/х(х-3)
5х-8х+24-3х²+9х/х(х-3)=0
6х+24-3х²/х(х-3)=0
6х+24-3х²=0
-3х²+6х+24=0
х²-2х-8=0
Д=в²-4*а*с=-2²-4*1*(-8)=36
х=2±6/2
х=2+6/2=4
х=2-6/2=-2
Ответ х1=-2,х2=4
Я Вам перерешал(а)
<span>1.
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<span>
A(1,-6)
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B(0,3)
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<span>
C(-4,9)
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