汽车原来以10m/s的速度在平直公路上匀速行驶，因为路口出现红灯，司机从较远的地方开始刹车，使汽车匀减速前进，当车速减到2m/s时，交通灯转为绿色，司机当即放开刹车，并且只用了减速过程的一半时间，汽车加速达到原来的速度，从刹车开始到恢复原来速度的过程用了12s．求：

    I have a good friend. His name is Nick. He is a middle school student.  He usually 1 at 5:30 every day. Then he has 2 quick breakfast and 3 to school at six. He usually goes to school by bus. First he 4 to the bus stop. Then the bus takes 5 to school. It usually takes him forty minutes6 to school.

    My home is about two miles from school. I usually leave for school at about 6: 30. I usually get to school 7 It takes me about twenty 8 But sometimes I got there by bike.  It takes me only ten minutes.

    There are different 9 to get to school. But I like10 best.

已知0＜α＜$\frac{\mathrm{\pi }}{2}$，cos（2π﹣α）﹣sin（π﹣α）=﹣$\frac{\sqrt{5}}{5}$．

（1）求sinα+cosα的值

（2）求$\frac{2\sin \alpha \cos \alpha -\sin \left(\frac{\mathrm{\pi }}{2}+\alpha \right)+1}{1-cot\left(\frac{3\mathrm{\pi }}{2}-\alpha \right)}$的值．