APPd

һ pd

̫ƽ܇W(wng) > m(x)

܇m(x)

1 2 3 4

܇ģDƬ

ʾ

_

֮ܲ鿴܇ҵĺ܇тĻ؏(f)Ŷ

Ҫᆖ