15．口算题
| 0.37+2.3= | 0.125×16= | 5÷7= | $\frac{3}{8}$×3= | $\frac{1}{3}$+1$\frac{1}{2}$= |
| $\frac{5}{6}$×$\frac{8}{15}$= | 0.5÷$\frac{1}{2}$= | $\frac{7}{8}$×1$\frac{1}{7}$= | 1-0.94= | 8.4÷0.07= |
| $\frac{39}{57}$-$\frac{20}{57}$= | 10.01÷10%= | 2-1$\frac{5}{7}$= | 1$\frac{1}{3}$÷$\frac{2}{3}$= | 40÷25%= |
13．下列图案中，含有旋转变化的有（ ）
0 157584 157592 157598 157602 157608 157610 157614 157620 157622 157628 157634 157638 157640 157644 157650 157652 157658 157662 157664 157668 157670 157674 157676 157678 157679 157680 157682 157683 157684 157686 157688 157692 157694 157698 157700 157704 157710 157712 157718 157722 157724 157728 157734 157740 157742 157748 157752 157754 157760 157764 157770 157778 199269
| A． | 4个 | B． | 3个 | C． | 2个 |