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               b)    x y  
                    x
                     y
                  2



               Negative Exponents:
                               1
               Symbols:  x m    if  x    0
                              x m


                              1               1
                                                           
                                   
                                                            2
               Example 8:      a)    3       b)       yx  
                                    1
                              3              yx   2



               Example 9: Simplify each expression given below.

                   a 5  b
               a)        
                  a 3  b 4




                   x 4   y
               b)        
                  x 2   y 5




                    6 sr  3  5
               c)            
                  18r  7 s 5 t 2




                     5 ba  4  6
               d)              
                   25a 2 b 6 c 3



                     x 8  3 y 5
               e)          
                  10 x  3 y 5 z




                  3 bca 3  5
               f)         
                  27a 4 bc 2


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