ính: 30hm + 15hm = 72dam – 27 dam = 65dm + 35dm =
Giải thích
30hm + 15hm = 45hm 72dam – 27 dam = 45dam 65dm + 35dm = 100dm
80m – 50m = 30m 38km + 52km = 90km 76cm – 18cm = 58cm
30hm + 15hm = 45hm 72dam – 27 dam = 45dam 65dm + 35dm = 100dm
80m – 50m = 30m 38km + 52km = 90km 76cm – 18cm = 58cm