黎叔叔打算买一套房，这套房分期付款要加价百分之15，如果一次性付清，优惠百分之十，这样分期付款比

                                           4万=40000                                                     解：设这套房子原价×元。                                            〔1+15∫〕×—〔1—10∫〕×＝40000                                                                  115∫×—90∫×＝ 40000                                                                              25∫ ×＝40000                                                                                    ×＝40000÷25∫                                                                                     ×＝ 160000           收起