12．直接写得数．
0 154370 154378 154384 154388 154394 154396 154400 154406 154408 154414 154420 154424 154426 154430 154436 154438 154444 154448 154450 154454 154456 154460 154462 154464 154465 154466 154468 154469 154470 154472 154474 154478 154480 154484 154486 154490 154496 154498 154504 154508 154510 154514 154520 154526 154528 154534 154538 154540 154546 154550 154556 154564 199269
| 0.54÷0.1÷5.4= | 1-$\frac{1}{9}$= | $\frac{1}{6}$+$\frac{1}{4}$= | 0.03×0.8= |
| 8.4÷0.6= | $\frac{7}{9}$-$\frac{1}{5}$= | 0.63÷0.7= | 1.25×0.8= |