20．直接写出得数
| 5.6÷10= | 2.006×1000= | 9.6+1.4= | 100-100÷20= | 6.36+3.64= |
| 26×5= | 1500÷25÷4= | 8.69-2.96= | 0.75+9.25= | 2.5+3.6-2.5+3.6= |
看图，回答下面的问题．
15．笔算，带*的要验算．
0 154395 154403 154409 154413 154419 154421 154425 154431 154433 154439 154445 154449 154451 154455 154461 154463 154469 154473 154475 154479 154481 154485 154487 154489 154490 154491 154493 154494 154495 154497 154499 154503 154505 154509 154511 154515 154521 154523 154529 154533 154535 154539 154545 154551 154553 154559 154563 154565 154571 154575 154581 154589 199269
| 380÷6 | *1231÷3 | 455÷5 | *895÷8 |