A.0.4 B.0.6 C.0.5 D.0.3
A.0.85 B.0.765 C.0.975 D.0.95
A.1.41 B.1.42 C.1.414 D.1.415
A.a=1，b=0 B.a=0，b为任意常数 C.a=0，b=0 D.a=1，b为任意常数
A.M B.2M C.6M D.8M
