1.найдите корень уровнения     3m    6      
                                               ---- =----         
                                               7      7                           
2.
найдите корень уровнения   7х-13=15 

3.вычислите 19,9*18-19,9*16+30,1*18-30,1*16  

4.решите уровнение   3,5 : х =0,8 : 2,4 


 
    
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