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Так:
xy''' + y'' = √x
v = y"; v' = y"'
xv' + v = √x
(x*v)' = √x --> x*v = 2x^(3/2)/3 + C1
y" = 2x^(1/2)/3 + C1/x
y' = 4x^(3/2)/9 + C1*ln|x|
y = 8x^(5/2)/45 - C1*x + C1*x*ln|x| + C2*x + C3
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