zy-z+2·z-5·z·y+5·z+6·y Intrans,Z一 其他例子: F(n+3)-3·F(n+1)+2·F(n) 0) F(1)=0F(2)=0 F(n+1)-F(n)- F(0)=0 F(n+3)-F(n+2)-9F(n+1)+9.F(n)F(0)=0F(1)=1F(2)=2z 2 × y z 2 - + 2 × z - 5 × z × y + 5 × z + 6 × y z (z - 7) z 2 ( - 5 × z + 6) × invztrans, z -4 3 n × 5 2 n ® + × 其他例子: F(n + 3) - 3 × F(n + 1) + 2 × F(n) F(0) = 1 F(1) = 0 F(2) = 0 F(n + 1) - F(n) 2 n - F(0) = 0 F(n + 3) - F(n + 2) - 9 F(n + 1) + 9 × F(n) F(0) = 0 F(1) = 1 F(2) = 2