Tính: a) 329 ml - 135 ml 200 g - 150 g 392 mm + 43 mm

a) 329 ml – 135 ml = 194 ml

200 g – 150 g = 50 g

    392 mm + 43 mm = 435 mm

b) 251 ml + 262 ml = 513 ml

37 g + 63 g – 30 g = 70 g

    87 mm – 17 mm + 10 mm = 80 mm