大家算一算．

3×6－2＝____   2×6＋5＝____   2×5＋2＝____

2×5＋1＝____   3×6＋6＝____   6×2＋3＝____

（2015•葫芦岛）如图所示滑轮组，在50s内将重5000N货物匀速吊起10m高．绳的自由端受到的拉力大小是1500N，关于该滑轮组的说法正确的是（不计绳重及摩擦）（　　）

已知函数f（x）=|x+2|+|2x﹣4|

在第21届温哥华冬奥会短道速滑女子1000米决赛中，我国选手王濛以1min29s的成绩夺冠，她在比赛中的平均速度约为____  m/s。（结果保留一位小数）

   Mrs. Black lives on Second Avenue. New Year is coming. She wants to send (寄) a card to her friend in Toronto, but she doesn’t know where the post office is. She asks her neighbor (邻居) Mary, “ Is there a post office near here? I want to send a card.”
   “The post office is not near from here,” answers Mary, “but you don’t need to go to the post office to post the card. There is a mailboxin front of the supermarket. You can put your card into the mailbox”