Page 65 - 初中数学核心题组——提升核心素养的培优框架
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七下  核心题组
                                                                              专题 1 幂的运算






                                      专题 1 幂的运算





              一、基本运算

              1. 计算。(书 P33 1)

                         3  2     3  3                   3       4
                (1) -      ⋅      = -          (2)(ab−    ) (ab⋅  −  ) =
                      
                         5     5
                                                          1   7    1 
                (3)     5  5                      (4) - x      ÷    - x =  
                                                        
                      ( ) =                               2     2 
                      -a
                (5)(ab+    ) (ab÷  3  +  ) =      (6)(-ab⋅  2  ) =  3

                         2
                      -a ⋅
                (7)( ) ( ) =  a 2  2              (8)( ) ( ) y÷ y 2  3  6  =
              2.已知 a   m  = 2 , a n  = 8 ,求 a m+ n  。(书 P4 2)

              二、巩固练习

              1. 计算:
                                                             3
                (1) aa⋅  3  =                     (2)(-4a  2 ) =



                                                         x
                (3)(ab−    ) (ab÷  8  −  ) =  4   (4)( ) ÷ 2  3  x =  6


                (5) a ÷  −  4  a =  −  6          (6)7 ×  0  6 =  -2



                      2
                (7) ( ) ()a 3  4 ⋅  a 26  =         (8)-a +  3  (-4a a =  ) 2


                                                              0
                                                                    -1
                                                                (
                (9)   ( ) r−  5  r ⋅  3  =        (10)(π −   ) 1 ⋅− 1 ) =
                                                                  2

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