19.直接写出得数
| 17×7= | 17×14= | 17×140= | 17×99×0= |
| 360÷90= | 88÷8= | 500÷25= | 84÷6= |
18.下面四道题中,商最小的算式是( )
| A. | 192÷8 | B. | 192÷16 | C. | 384÷16 | D. | 384÷8 |
16.两个不为0的数相乘,这两个因数都扩大2倍,积( )
0 129509 129517 129523 129527 129533 129535 129539 129545 129547 129553 129559 129563 129565 129569 129575 129577 129583 129587 129589 129593 129595 129599 129601 129603 129604 129605 129607 129608 129609 129611 129613 129617 129619 129623 129625 129629 129635 129637 129643 129647 129649 129653 129659 129665 129667 129673 129677 129679 129685 129689 129695 129703 199269
| A. | 扩大4倍 | B. | 扩大2倍 | C. | 不变 | D. | 缩小2倍 |