| 脱式计算。(能简算的要用简便方法计算) | ||||||
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| (1)3190-[3124-(962-39)] =3190-[3124-923] =989 | (2)(125×83+125×17)×8 =125×(83+17)×8 =100000 | (3)226×13-26×13 =(226-26)×13 =2600 |
| (4) [275-(32+46)]×28 =[275-78]×28 =5516 | (5)81000÷125÷8 =81000÷(125×8) =81 | (6)280×36+360×72 =72×(140+360) =36000 |