X NẾU X 0 X NẾU X > 0  .

1- - CHUONG II HAM SOTONG HOP CAC BAI TOAN CO BAN VANANG CAO BAI KIEM TRA 45
CHUONG II HAM SOTONG HOP CAC BAI TOAN CO BAN VANANG CAO BAI KIEM TRA 45

1- x nếu x 0

 

x nếu x > 0 

 .