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let
u=y'
xy''-y'+2 =0
xu' -u +2 =0
xu' = u-2
∫du/吵配(u-2) = ∫dx/x
ln|u-2| =ln|x| + C'
u-2 = C1'升告指.x
dy/dx = C1'.x +2
y =∫ [C1'.x +2] dx
= (1/友薯2)C1'x^2 +2x + C2
=C1.x^2 +2x + C2
u=y'
xy''-y'+2 =0
xu' -u +2 =0
xu' = u-2
∫du/吵配(u-2) = ∫dx/x
ln|u-2| =ln|x| + C'
u-2 = C1'升告指.x
dy/dx = C1'.x +2
y =∫ [C1'.x +2] dx
= (1/友薯2)C1'x^2 +2x + C2
=C1.x^2 +2x + C2
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