| 计算 125×25×32 31×55+68×55+55 201×28 26×199. |
| (1)125×25×32 =125×25×4×8 =(125×8)×(25×4) =1000×100 =100000; (2)31×55+68×55+55 =55×(31+68+1) =55×100 =5500; (3)201×28 =(200+1)×28 =200×28+28 =5600+28 =5628; (4)26×199 =26×(200-1) =26×200-26 =5200-26 =5174; 故答案为100000;5500;5628;5174. |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35