Page 52 - 振昆讲速算
P. 52

A×B6875=A×10000×(B+ )=A×10000×(B+                                          16−4−1    )=A×10000×(B + 1 -   -   )
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                                                          11
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                                                          16                                 16                                        4     16

               A×B8125=A×10000×(B+ )=A×10000×(B+                                         16−4+1   )=A×10000×(B+1-   +   )
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                                                                                                                                          1
                                                          13
                                                          16                                16                                     4     16
               A×B9375=A×10000×(B+ )=A×10000×(B+                                         16−1  )=A×10000×(B+1-                    1   )
                                                          15
                                                          16                              16                                     16

               A×B10625=A×10000×(B+ )=A×10000×(B+                                          16+1  )=A×10000×(B+1 +   )
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                                                            17
                                                            16                              16                                      16

             例2.  3 8 5 2 7×6 9 3 7 5 =   3 8 5 2 7 0 0 0 0×(7 -                                1   )

                                                                                               16
                     3 8 5 2 7 0 0 0 0×7     =     2 6 9 6 8 9 0 0 0 0
                 -   3 8 5 2 7 0 0 0 0÷1 6  =  -        2 4 0 7 9 3 7 5

                                                                 2 6 7 2 8 1 0 6 2 5























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