计算下面各题,能简便的用简便方法计算.(841-41)÷25×483×29+71×83101×99199+199×99560÷[490÷(34+36)]28×37+73×37-37.
(1)(841-41)÷25×4 =800÷25×4 =32×4 =128; (2)83×29+71×83 =83×(29+71) =86×100 =8500; (3)101×99 =(100+1)×99 =100×99+1×99 =9900+99 =9999; (4)199+199×99 =(199+1)×99 =200×99 =19800; (5)560÷[490÷(34+36)] =560÷[490÷70] =560÷7 =80; (6)28×37+73×37-37 =(28+73-1)×37 =100×37 =3700. |