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  • 1. 脱式计算。                                       

    1. (1) 300-5680÷80+30                                                 
    2. (2) 3516-(2434-64×12)                                             
    3. (3) 1880-25×32+60                                       
    4. (4) 12500 ÷25+85×42                                       
    5. (5) 228+252÷28×13                                    
    6. (6) 780 –(26+280 ÷40)                                       

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