19.直接写得数.
0 158496 158504 158510 158514 158520 158522 158526 158532 158534 158540 158546 158550 158552 158556 158562 158564 158570 158574 158576 158580 158582 158586 158588 158590 158591 158592 158594 158595 158596 158598 158600 158604 158606 158610 158612 158616 158622 158624 158630 158634 158636 158640 158646 158652 158654 158660 158664 158666 158672 158676 158682 158690 199269
$\frac{1}{21}$+$\frac{3}{7}$+$\frac{2}{3}$= | 1-$\frac{1}{54}$= | 10-0.01= | $\frac{3}{5}$÷5= |
($\frac{1}{6}$-$\frac{1}{9}$)×18= | $\frac{11}{24}$÷$\frac{17}{24}$= | 2.4÷1%= | $\frac{11}{21}$×$\frac{9}{11}$×$\frac{7}{3}$= |