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@ @¶ìÿa@óÝy‹¾a@ u@                    @SX

                                        :( )         (. )

    . 3.9 × 32 ≈ 4 × 32 = 8             :( )              ()
                                        :( )
        15.7 16                                           ()
                                                          ()
   . 3.96 × 4.141 ≈ 4 × 4 = 16

901 ÷ 0.303 ≈ 900 ÷ 0.3 = 9000 ÷ 3 = 3000            ()
                                                     ()
                                     :( )            ()
                                                     ()
       . 69.8 ÷ 0.7 ≈ 70 ÷ 0.7 = 100                 ()

                                     :( )

            .1×3 = 1×3 = 1

             3 5 3×5 5

                                           :( )

. 4 2 ÷ 2 = 14 × 5 = 14 × 5 = 2 × 7 × 5 = 35 = 11 2
3 5 3 2 3×2             3×2                3     3

                                           :( )

. 2 1 ÷ 3 3 = 7 ÷ 15 = 7 × 4 = 28

   3 4 3 4 3 15 45

                                :( )

2  +7       4  + 49
7     2        14
         =           =  53 × 21  =  21  =  3

   53 53 14 53 14 2

   21 21
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