①圆规每只10元,②三角板每付6元,③量角器每只4元;根据学校的销量情况,三种学具共需进购500只(付),其中三角板付数是圆规只数的3倍.
在△ABC中,AB=12 2 ,AC=13,cos∠B= 22 ,则BC边长为( )
— Where was your dad at this time last night? —He was talking with my uncle I was looking for some information on the Internet.
如图,从A到B最短的路线是( )