• 2022-06-08
    买7顶红帽子,11顶蓝帽子,25顶黄帽子,9顶白帽子要177元.10顶红帽子,16顶蓝帽子,37顶黄帽子,13顶白帽子要257元.1顶红帽子,1顶蓝帽子,1顶黄帽子,1顶白帽子要多少元?