题型:填空题 若( x2-2x+3)n=a2nx2n+a2n-1x2n-1+…+a1x+a0,则a2n+a2n-2+…+a4+a2+a0=( )A.2nB.3nC.12(6n+2n)D.12(6n-2n) 查看答案