A.2:1,1:1, B.1:1,2:1, C.2:4,1:1, D.1:1,2:4,
A.1.25,2.4 B.1.252.4 C.x=1.25,y=2.4 D.x=1.25y=2.4
A.0 B.1 C.5 D.6