A) 59 KG – 12 KG – 6 KG = 100L – 8L =45 – 5 – 5 = 16 – 9 + 7 =B) 23 CM + 6 CM – 1 CM = 80 – 10 – 7 =43 DM – 3 DM + 7 DM = 36 + 4 – 5 =C) 9 + 8 + 1 = 13 + 5 + 5 =6 + 2 + 4 = 36 – 6 – 4 =Y+ 73 = 100 Y– 38 = 6256 +Y= 81 69 –Y= 2439 +Y= 93 + 6 54 –Y= 3842 –Y=...

6. Tính nhẩm:a) 59 kg – 12 kg – 6 kg = 100l – 8l =45 – 5 – 5 = 16 – 9 + 7 =b) 23 cm + 6 cm – 1 cm = 80 – 10 – 7 =43 dm – 3 dm + 7 dm = 36 + 4 – 5 =c) 9 + 8 + 1 = 13 + 5 + 5 =6 + 2 + 4 = 36 – 6 – 4 =y+ 73 = 100 y– 38 = 6256 +y= 81 69 –y= 2439 +y= 93 + 6 54 –y= 3842 –y= 21 - 9 y– 17 = 16 + 38