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bbbrgbhgnfjek
@bbbrgbhgnfjek
August 2021
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{0.7x+6y=27.9
{1.5x-2y= -14.5 решите систему
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nikota03
nikota03
У=(27,9-0,7х)/6, тогда
1,5х-2*(27,9-0,7х)/6=-14,5
1,5х-(27,9-0,7х)/3=-14,5
(4,5х-27,9+0,7х)/3=-14,5
(5,2х-27,9)/3=-14,5
х=-3, тогда
у=(27,9-0,7*(-3))/6
у=30/6
у=5
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