关于否定句中回答yes或no的问题,学哥学姐们帮忙讲解一下,谢谢啦~

All the students haven't finished their homework.
_____(No),because some students watched the final football match until far into night.

再帮忙举几个例子吧,再次谢谢啦~

第1个回答  2013-03-08
点P从B出发沿BA方向向点A匀速运动,速度为1 cm / s的点Q C,AQ的2厘米/秒的速度从一个统一的运动= 2PB菱形帮助PC = PQ组PB =吨AQ = 2T AC,BC,通过P-垂直分别交叉E,F
所以QE的2 - 叔AE = 2 + T的PE / BC = AE / AC PE =(6 +3 T) / BF / BC = PB / AB BF = 3T / 5 FC = BC-BF = 3-3T / 5
FC = PE-3T / 5 =(6 +3 T)/ T = 10/9 PE = 7/3 QE = 8/9
PQ ^ 2 = PE ^ 2 + QE ^ 2 PQ =,505/9的平方根