| 计算下列各题。 | ||||||
|
| (1)25×12×8 =300×8 =2400 |
(2)125×25×4×2 =(125×2)×(25×4) =250×100 =25000 |
(3)19×25×4×4 =19×100×4 =7600 |
| (4)46×125×8 =46×(125×8) =46×1000 =46000 |
(5)158+236+342+164 =158+342+(236+164) =500+400 =900 |
(6)25×64 =25×4×16 =100×16 =1600 |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35