代数式2x²+x+4的值是7,则代数4x²+2x+1的值是2x²+x = 7- 4 = 3 数4x²+2x+1= 2(2x²+x) +1 = 2 x 3 +1 = 7施主,我看你骨骼清奇,器宇轩昂,且有慧根,乃是万中无一的武林奇才.潜心修习,将来必成...朕准了