设f1(x),f2(x)是二阶线性齐次方程y″+p(x)y′+q(x)y=0的两

考试题库2022-08-02  9

问题 设f1(x),f2(x)是二阶线性齐次方程y″+p(x)y′+q(x)y=0的两个特解,则c1f1(x)+c2f2(x)(c1,c2是任意常数)是该方程的通解的充要条件为(  )。A.f1(x)f2′(x)-f2(x)f1′(x)=0B.f1(x)f2′(x)+f1′(x)f2(x)=0C.f1(x)f2′(x)-f1′(x)f2(x)≠0D.f1′(x)f2(x)+f2(x)f1(x)≠0

选项 A.f1(x)f2′(x)-f2(x)f1′(x)=0
B.f1(x)f2′(x)+f1′(x)f2(x)=0
C.f1(x)f2′(x)-f1′(x)f2(x)≠0
D.f1′(x)f2(x)+f2(x)f1(x)≠0

答案 C

解析
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