∵M(3,-2),N(-5,-1),
∴12MN=12(-8,1)
=(-4,12).
故答案为:(-4,12).
三角形的外角和五边形的内角和的比为( )。
.It’s disappointing that no one could _________ a good idea to help us out of trouble.
A.come off it
B.come up
C.come up with
D.come about