数学课上,鸵鸟老师在黑板上写了这样一道竞赛题:在一个长为1580米、宽为780米的长方形居住区内,修有横竖4条柏油路(如图1),路面宽10米,求这个居住区除了道路以外剩余部分的面积。鸵鸟老师要大家来个比赛,算完就举手示意。谁算得快,算得对, In math class, the ostrich teacher wrote a contest question on the blackboard: in a rectangular residential area of ​​1580 meters in length and 780 meters in width, there are 4 asphalt roads (Figure 1), with a width of 10 meters Ask for the area of ​​the living area other than the rest of the road. Ostrich teacher to everyone to a game, finished hand gesture. Who considered fast, right,