78. Calculeaza
a) 51 +8 dl = 7 d
23 dam + 450 dm = ?
35 kg - 230 g =78
b) 600 mm - 40 cm ? dm
90 0001 - 407
2 900 dag +7q?
c) 45kgx6=?kg
360t*9=?kg
45 m ×15​=?dm