用竖式计算。845-350=501-329=
(1)×39 + ×25 + × (2)1×(2 - )+ 15÷
计算: (1)73× (2) 166÷41
计算:(1)×37(2)2004×
计算:
计算:(1998+19981998+199819981998+…)÷(1999+19991999+199919991999…)×1999