11．直接写得数．
0 158691 158699 158705 158709 158715 158717 158721 158727 158729 158735 158741 158745 158747 158751 158757 158759 158765 158769 158771 158775 158777 158781 158783 158785 158786 158787 158789 158790 158791 158793 158795 158799 158801 158805 158807 158811 158817 158819 158825 158829 158831 158835 158841 158847 158849 158855 158859 158861 158867 158871 158877 158885 199269
| 0.3+4= | $\frac{2}{3}$+$\frac{1}{2}$= | 51×$\frac{3}{17}$= | $\frac{3}{7}$+$\frac{7}{9}$= | 4×$\frac{1}{2}$÷4×$\frac{1}{2}$= |
| 0.52= | $\frac{3}{5}$+60%= | $\frac{1}{5}$-$\frac{1}{6}$= | 2.4×5= | 10-3.2-5.8= |
玻璃厂用卡车运进一批做玻璃用的沙子，堆成一个圆锥形，（如图）每立方米沙重1.7吨，这堆沙子重多少吨？