2．直接写得数．
0 156559 156567 156573 156577 156583 156585 156589 156595 156597 156603 156609 156613 156615 156619 156625 156627 156633 156637 156639 156643 156645 156649 156651 156653 156654 156655 156657 156658 156659 156661 156663 156667 156669 156673 156675 156679 156685 156687 156693 156697 156699 156703 156709 156715 156717 156723 156727 156729 156735 156739 156745 156753 199269
| 12.5+12.5= | 0.8-0.45= | 31.07×100= |
| 0.78-0.6= | 9.2+0.08= | 7×（36-15）= |
| 6.24-6.04= | 6.78+0.23= | $\frac{1}{10}$-0.01= |
