如图所示，三个正方形的边长分别是12cm，9cm，7cm，求图中四边形ABCD的面积．
3．合理计算下面个题．
| $\frac{3}{8}$÷3+$\frac{3}{8}$÷2 | $\frac{4}{5}$×3.9+6.1×$\frac{4}{5}$ | $\frac{8}{25}$÷0.8×$\frac{2}{3}$ |
| 10.25-5.89+0.75-4.11 | $\frac{3}{46}$×45 |
2．直接写出得数．
0 154887 154895 154901 154905 154911 154913 154917 154923 154925 154931 154937 154941 154943 154947 154953 154955 154961 154965 154967 154971 154973 154977 154979 154981 154982 154983 154985 154986 154987 154989 154991 154995 154997 155001 155003 155007 155013 155015 155021 155025 155027 155031 155037 155043 155045 155051 155055 155057 155063 155067 155073 155081 199269
| 25×0.2= | 10-0.86= | 24×$\frac{3}{4}$= | $\frac{3}{7}$÷3= |
| 4.8÷0.8= | 8÷$\frac{4}{5}$= | 1-1÷9= | $\frac{2}{3}$-$\frac{2}{3}$×0= |