1.26x4+74x4 9x(68+23)(55+35)x6 (a+b)xc 2.(25+9)x7 25x7+9x736x4+36x6 36x(4+6)36x3+36 36x(3+1)21x12+12x22 12x(21+22) 3.　最多要花26×(68＋42)＝2860(元)，最少要

1.26x4+74x4 9x(68+23)(55+35)x6 (a+b)xc 2.(25+9)x7 25x7+9x736x4+36x6 36x(4+6)36x3+36 36x(3+1)21x12+12x22 12x(21+22) 3.　最多要花26×(68＋42)＝2860(元)，最少要