估算:705500-50800≈5035433-205000≈305500-108900≈805433+205000≈855500-579900≈533533-205130≈
计算:(1)2000÷2000(2)
(1)×39 + ×25 + × (2)1×(2 - )+ 15÷
计算: (1)73× (2) 166÷41
计算:(1)×37(2)2004×
计算: