用简便方法计算
208×33+208×67 | 125×13×8 | (4000+4)×25 |
638+195+805 | 978×99+978 | 125×32×25. |
直接写得数 80×20= | 16×20= | 40×30= | 30×50= |
13×4= | 12×40= | 84÷4= | 500×7= |
0÷90= | 22×3= | 3500÷5= | 15.6+4.3= |
15×6= | 7×400= | 1.51+2.34= | 11×8= |
208×33+208×67 | 125×13×8 | (4000+4)×25 |
638+195+805 | 978×99+978 | 125×32×25. |
直接写得数 80×20= | 16×20= | 40×30= | 30×50= |
13×4= | 12×40= | 84÷4= | 500×7= |
0÷90= | 22×3= | 3500÷5= | 15.6+4.3= |
15×6= | 7×400= | 1.51+2.34= | 11×8= |