| 用简便方法计算. 8×23×125 25×24 399×25 452+298. |
| (1)8×23×125 =8×125×23 =1000×23 =23000 (2)25×24 =25×(4×6) =25×4×6 =100×6 =600 (3)399×25 =(400-1)×25 =400×25-1×25 =10000-25 =9975 (4)452+298 =452+(300-2) =452+300-2 =750 |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35