18．直接写出得数．
0 162457 162465 162471 162475 162481 162483 162487 162493 162495 162501 162507 162511 162513 162517 162523 162525 162531 162535 162537 162541 162543 162547 162549 162551 162552 162553 162555 162556 162557 162559 162561 162565 162567 162571 162573 162577 162583 162585 162591 162595 162597 162601 162607 162613 162615 162621 162625 162627 162633 162637 162643 162651 199269
| 0.35+0.45= | 0.58+0.8= | 3.6+0.12= | 1.6-0.9= |
| 8-5.3= | 0.6+0.37= | 3.8+0.17= | 2.6-0.85= |
| 0.35+0.65= | 5.3-2.7= | 8.5+2.5= | 4.6-3.9= |