6.某商店售货时,在进价基础上加一定利润,其数量x与售价y如下表所示,则售价y与数量x的函数关系式为( )
| 数量x(千克) | 1 | 2 | 3 | 4 | … |
| 售价y(元) | 8+0.4 | 16+0.8 | 24+1.2 | 32+1.6 | … |
| A. | y=8+0.4x | B. | y=8x+0.4 | C. | y=8.4x | D. | y=8.4x+0.4 |
1.已知a2+b2=$\frac{2}{3}a-6b-\frac{82}{9}$,则ab=( )
| A. | -1 | B. | 27 | C. | 9 | D. | 3 |
17.
如图,在一个高为3米,长为5米的楼梯表面铺地毯,则地毯长度为( )米.
0 294546 294554 294560 294564 294570 294572 294576 294582 294584 294590 294596 294600 294602 294606 294612 294614 294620 294624 294626 294630 294632 294636 294638 294640 294641 294642 294644 294645 294646 294648 294650 294654 294656 294660 294662 294666 294672 294674 294680 294684 294686 294690 294696 294702 294704 294710 294714 294716 294722 294726 294732 294740 366461
| A. | 4米 | B. | 5米 | C. | 7米 | D. | 8米 |