5.
某超市在晚间优惠销售橘子,购买2千克以下按原价,购买2千克以上按优惠价.购买橘子的总价钱y(元)与购买橘子的总质量x(千克)之间的函数关系的图象如图所示,则一次性购买5千克橘子比分五次购买1千克橘子可节省( )
0 284658 284666 284672 284676 284682 284684 284688 284694 284696 284702 284708 284712 284714 284718 284724 284726 284732 284736 284738 284742 284744 284748 284750 284752 284753 284754 284756 284757 284758 284760 284762 284766 284768 284772 284774 284778 284784 284786 284792 284796 284798 284802 284808 284814 284816 284822 284826 284828 284834 284838 284844 284852 366461
| A. | 12元 | B. | 10元 | C. | 8元 | D. | 6元 |