Rút gọn rồi tính: a) 39×54=..........................................b) 1015×35=..........................................c) 58×412=.......................................... d) 927×321=..........................................
Rút gọn rồi tính: a) 39×54=..........................................b) 1015×35=..........................................c) 58×412=.......................................... d) 927×321=..........................................
