| 简便计算. 35×7×2 9×250×4 201×45 236+199. |
| (1)35×7×2 =35×2×7 =70×7 =490 (2)9×250×4 =9×(250×4) =9×1000 =9000 (3)201×45 =(200+1)×45 =200×45+1×45 =9000+45 =9045 (4)236+199 =236+200-1 =435 |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35