3．一段公路每天修全长的$\frac{1}{12}$，4天修了全长的$\frac{1}{3}$，一桶油重$\frac{3}{2}$千克，$\frac{1}{2}$桶油重$\frac{3}{4}$千克．
19．直接写得数．
0 154459 154467 154473 154477 154483 154485 154489 154495 154497 154503 154509 154513 154515 154519 154525 154527 154533 154537 154539 154543 154545 154549 154551 154553 154554 154555 154557 154558 154559 154561 154563 154567 154569 154573 154575 154579 154585 154587 154593 154597 154599 154603 154609 154615 154617 154623 154627 154629 154635 154639 154645 154653 199269
| $\frac{4}{5}÷\frac{5}{8}$= | $\frac{3}{4}×6$= | 0.1÷10%= | |
| a-$\frac{2}{5}$a= |