11．直接写得数
| $\frac{1}{5}$×2= | 7×$\frac{3}{14}$= | $\frac{1}{5}$×$\frac{2}{5}$= | $\frac{3}{18}$×9= |
| $\frac{7}{10}$×$\frac{2}{5}$= | $\frac{1}{26}$×13= | $\frac{21}{53}$×0= | $\frac{7}{8}$×$\frac{7}{14}$= |
| $\frac{5}{8}$×4= | $\frac{3}{22}$×11= | 1×$\frac{7}{9}$= | $\frac{3}{4}$×$\frac{4}{3}$= |
10．长为400米，宽为100米的长方形操场占地（ ）公顷．
0 162434 162442 162448 162452 162458 162460 162464 162470 162472 162478 162484 162488 162490 162494 162500 162502 162508 162512 162514 162518 162520 162524 162526 162528 162529 162530 162532 162533 162534 162536 162538 162542 162544 162548 162550 162554 162560 162562 162568 162572 162574 162578 162584 162590 162592 162598 162602 162604 162610 162614 162620 162628 199269
| A． | 40000 | B． | 400 | C． | 4 |
下面是李奶奶家刚收到的水费通知单，单子上有一处不慎被污渍涂染了．