5.口算
| 0.35×0.1= | 0.25×40= | 0.8÷10= | 1-0.89= |
| 5.6-0.3= | 5.6-4= | 12÷100= | 5.4÷100= |
20.大于零且小于一的一位小数有( )个.
| A. | 1 | B. | 10 | C. | 9 |
19.如果将小数3.68的小数点向左移动一位,这个小数比原来( )
| A. | 缩小0.368 | B. | 增加0.368 | C. | 减少3.312 |
18.把一根木料锯成四段,用了12分,再把每一段锯成两段还需要( )分.
| A. | 18 | B. | 12 | C. | 16 |
17.下面的式子中,方程的有( )
| A. | 0.54+2x=0.1×8 | B. | 5x+6.2>18.5 | C. | 2.8×5+3x | D. | 7.2+2×4=15.4 |
16.方程4x-0.6=0.2的解是( )
0 158607 158615 158621 158625 158631 158633 158637 158643 158645 158651 158657 158661 158663 158667 158673 158675 158681 158685 158687 158691 158693 158697 158699 158701 158702 158703 158705 158706 158707 158709 158711 158715 158717 158721 158723 158727 158733 158735 158741 158745 158747 158751 158757 158763 158765 158771 158775 158777 158783 158787 158793 158801 199269
| A. | x=0.2 | B. | x=0.1 | C. | x=5 | D. | x=10 |