Whlie intelligent people can often the complex,a fool is more likely to complicate the simple.
A:sacrifice
B:substitute
C:simplify
D:survive
如图,点O是△ABC内一点,连结OB、OC,并将AB、OB、OC、AC的中点D、E、F、G依次连接,得到四边形DEFG.
如图,在△ABC中,AB=AC,D为BC上一点,且DA=DC,BD=BA,则∠B的大小为( )
若(4a2-4+12-a)•w=1,则w=( )