设y1、y2是方程y′′+P(x)y′+Q(x)y=0的两个不同的解,则Y=C1y1+C2y2()
A.可能是方程的通解
B.一定不是方程的通解
C.一定是方程的通解
D.一定不是方程的解
正确答案是A
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