6．口算．
0 158382 158390 158396 158400 158406 158408 158412 158418 158420 158426 158432 158436 158438 158442 158448 158450 158456 158460 158462 158466 158468 158472 158474 158476 158477 158478 158480 158481 158482 158484 158486 158490 158492 158496 158498 158502 158508 158510 158516 158520 158522 158526 158532 158538 158540 158546 158550 158552 158558 158562 158568 158576 199269
| $\frac{7}{15}$×10= | 12×$\frac{5}{16}$= | 14×$\frac{4}{7}$= | $\frac{10}{21}$×14= |
| $\frac{8}{9}$×6= | $\frac{5}{18}$×5= | 20×$\frac{7}{15}$= | 63×$\frac{8}{27}$= |
| 64×$\frac{5}{16}$= | 81×$\frac{7}{54}$= | $\frac{25}{36}$×18= | $\frac{13}{42}$×30= |
