①同旁内角互补;②直线外一点与直线上各点连接的所有线段中,垂线段最短;③从直线外一点到这条直线的垂线段的长度,叫做点到直线的距离;④平行线间的距离处处相等.
(2+1)(22+1)(24+1)
=(2﹣1)(2+1)(22+1)(24+1)
=(22﹣1)(22+1)(24+1)
=(24﹣1)(24+1)
=28﹣1
化简:(3+1)(32+1)(34+1)(38+1)=.