| 怎样简便就怎样算。 | ||||
|
| (1)25×13×4 =25×4×13 =100×13 =1300 |
(2)99×21 =(100-1)×21 =100×21-21 =2100-21 =2079 |
| (3)134+273+266+127 =(134+266)+(273+127) =400+400 =800 |
(4)258+74+26 =258+(74+26) =258+100 =358 |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35