19.用递等式计算.(能简便的用简便计算)
0.36×1.5+8.26 | 2.35-0.84÷2.4 | 2.25×3.6÷1.8 |
12.5×0.67×0.8-6.7 | 4.7×5.2+4.8×4.7 | 1.23×98+2.46 |
16.直接写出得数.
1.2+0.68= | 9-3.97= | 0.16÷4= | 2.5×0.4= |
0.6×1.1= | 1.5+5= | 10+0.1×0.01= | 1.2+1.2÷3= |
15.把1张长方形纸连续对折3次,每一份是这张纸的( )
0 162616 162624 162630 162634 162640 162642 162646 162652 162654 162660 162666 162670 162672 162676 162682 162684 162690 162694 162696 162700 162702 162706 162708 162710 162711 162712 162714 162715 162716 162718 162720 162724 162726 162730 162732 162736 162742 162744 162750 162754 162756 162760 162766 162772 162774 162780 162784 162786 162792 162796 162802 162810 199269
A. | $\frac{1}{8}$ | B. | $\frac{1}{4}$ | C. | $\frac{1}{3}$ |