.3. Tính nhanh a) (–219) + 263 + 319 + (–163) b) (–125).25.(–8).(–4).123 c) (225 – 1576) – (125 – 1576 + 176) d) 63 – 9.(10 + 7) e) 45.( –69) + 31.(–4
.3. Tính nhanh a) (–219) + 263 + 319 + (–163) b) (–125).25.(–8).(–4).123 c) (225 – 1576) – (125 – 1576 + 176) d) 63 – 9.(10 + 7) e) 45.( –69) + 31.(–45) + (–27) g) (–23).(–48) – 23.148 – 245 h) 47.(27 – 15) – 27.(47 – 15) i) 162 (73 49) (73 … Đọc tiếp