Tính bằng cách thuận tiện
Giải thích
a) 31,559 + 18,801 – 4,559 = (31,559 – 4,559) + 18,801 = 27 + 18,801 = 45,801
b) 19,27 – 6,73 – 3,27 = (19,27 – 3,27) – 6,73 = 16 – 6,73 = 9,27
a) 31,559 + 18,801 – 4,559 = (31,559 – 4,559) + 18,801 = 27 + 18,801 = 45,801
b) 19,27 – 6,73 – 3,27 = (19,27 – 3,27) – 6,73 = 16 – 6,73 = 9,27