10．直接写出得数．
| 0.25×300= | 2.25+2.75= | 2.35×7= | 44÷11÷10= |
| 2.45÷7+57.57= | 0.1÷0.01= | 44÷4+4×14= | 2.5-1.7= |
6．计算下列各题，怎样简便怎样算．
0 159733 159741 159747 159751 159757 159759 159763 159769 159771 159777 159783 159787 159789 159793 159799 159801 159807 159811 159813 159817 159819 159823 159825 159827 159828 159829 159831 159832 159833 159835 159837 159841 159843 159847 159849 159853 159859 159861 159867 159871 159873 159877 159883 159889 159891 159897 159901 159903 159909 159913 159919 159927 199269
| 105×13-1890÷18 | [$\frac{1}{2}$-（$\frac{3}{4}$-$\frac{3}{5}$）]÷$\frac{7}{10}$ | 25×$\frac{3}{5}$+2.75÷$\frac{5}{3}$ |
| 27.4-52.8÷（1.9+2.1） | （0.125×8-0.5）×4 | 9.25×9.9+0.925 |
