15.用简便方法计算下面各题.
125×103-125×3 | 83×5+5×17 | 2700-425-175 |
2000÷8÷125 | 41+127+59+173 | 25×19×4 |
14.口算:
125×8= | 164-56= | 74+67= | 300÷12= | 450×20= |
300-82= | 299+63= | 13×4+17×4= | 720÷18= | 25×56= |
8.比较大小2.099( ) 2.100.
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