5．直接写得数：
| $\frac{1}{2}$-$\frac{1}{5}$= | 6×$\frac{2}{3}$= | 0×$\frac{5}{8}$= | $\frac{2}{5}$×$\frac{6}{7}$= |
| $\frac{1}{4}$+$\frac{1}{3}$= | 120×$\frac{7}{5}$= | $\frac{3}{8}$×$\frac{6}{7}$= | $\frac{14}{15}$×$\frac{5}{6}$= |
1．口算
0 163388 163396 163402 163406 163412 163414 163418 163424 163426 163432 163438 163442 163444 163448 163454 163456 163462 163466 163468 163472 163474 163478 163480 163482 163483 163484 163486 163487 163488 163490 163492 163496 163498 163502 163504 163508 163514 163516 163522 163526 163528 163532 163538 163544 163546 163552 163556 163558 163564 163568 163574 163582 199269
| 0.64+0.16= | 0.8+0.35= | 5.5-0.7= | 3.64+4.72= |
| 4.9+1.1= | 7.5-5= | 1.8万-1万= | 4.2+4.2= |
| 6-0.07= | 0+2.8= | 8.4-4= | 1.25+0.5= |