题目

用简便方法计算。                                                              (1) 25×32+25×48                                                        (2) 27×99+27                                                            (3) 36×99                                                               (4) 18×26+83×26-26                                                            (5) 57×99+57                                                    (6) 103×87 答案: 25×32+25×48=25×(32+48)=25×80=2000 27×99+27=27×(99+1)=27×100=2700 36×99=36×(100-1)=36×100-36=3600-36=3564 18×26+83×26-26=(18+83-1)×26=100×26=2600 57×99+57=(99+1)×57=100×57=5700 103×87=(100+3)×87=100×87+87×3=8700+261=8961                                                 
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