[考古] 元智的兩題怪題目...
1.
find the general solution of y"+2y'+y=e^-x.
2.
find a function y=f(x) satisfying (x^2)y'-2xy-y=0
(x不等於0) and f(1)=1/e
請各位大大幫忙解惑一下...請問各位大大有誰能助我一臂之力...
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