阅读古诗，回答相关问题。

                                                                                           四时田园杂兴•春日
                                                                                                   【宋】范成大
                                                                            土膏^①欲动雨频催，万草千花一饷^②开。
                                                                            舍后荒畦犹绿秀， 邻家鞭笋^③过墙来。
                                       注：①土膏：指肥沃的土地。 ②一饷，片刻。饷，通“晌”。 ③鞭笋：细长的竹笋

I can't go out because it's snowing heavily.          

计算下面各题。

57×7=____     69×5=   ____     78×9=____