Question

1.函数f(x)=(x+1)/(x-2009)在区间[2010,2011]上有最大值和最小值吗?

Answer 1

f(x)=(x+1)/(x-2009)在区间[2010,2011]上有最大值f(2010)=2011和最小值f(2011)=1006

A={(0,6),(1,5),(2,4),(3,3),(4,2),(5,1),(6,0)},B={x|x=2k,k∈N*}

A={y|y≥-2},B={y|y∈}

A∪B=R