90 y Y2 y3 Y4 y C X 3 11-100 0 y 0(-3)-110 y 0-6-101 0-6-300 比 值 6/-3-3/-1比 值 --- -6/-3 -3/-1 --- --- -Z 6 0 -6 -3 0 0 1 1 -1 0 0 0 -3 -1 1 0 0 -6 -1 0 1 2 -1 -1 y1 y4 y5 -3 0 0 -3 -9 0 0 0 y1 y2 y3 y4 y5 cj yj X b CB B