设f(x)与g(x)在(-∞,+∞)上都有定义,且x=x1是f(x)的唯一间断点,x
题型:单项选择题
问题:
设f(x)与g(x)在(-∞,+∞)上都有定义,且x=x1是f(x)的唯一间断点,x=x2是g(x)的唯一问断点.则()
A.当x1=x2时,f(x)+g(x)必有唯一的间断点x=x1
B.当x1≠x2时,f(x)+g(x)必有两个间断点x1与x2
C.当x1=x2时f(x)g(x)必有唯一的间断点x=x1
D.当x1≠x2时f(x)g(x)必有两个间断点x1与x2
设f(x)与g(x)在(-∞,+∞)上都有定义,且x=x1是f(x)的唯一间断点,x=x2是g(x)的唯一问断点.则()
A.当x1=x2时,f(x)+g(x)必有唯一的间断点x=x1
B.当x1≠x2时,f(x)+g(x)必有两个间断点x1与x2
C.当x1=x2时f(x)g(x)必有唯一的间断点x=x1
D.当x1≠x2时f(x)g(x)必有两个间断点x1与x2