如图，转动转盘，指针落在C区域的可能性最小，指针落在B区域可能性最大．
13．用竖式计算，并指出哪些是循环小数．
| 7.05÷0.94 | 1.71÷3.8 |
| 4.83÷0.7 | 5.7÷9 |
| 38.2÷2.7 | 2.16÷18 |
| 1.8÷0.25 | 3.7÷2.2． |
8．直接写得数．
0 138209 138217 138223 138227 138233 138235 138239 138245 138247 138253 138259 138263 138265 138269 138275 138277 138283 138287 138289 138293 138295 138299 138301 138303 138304 138305 138307 138308 138309 138311 138313 138317 138319 138323 138325 138329 138335 138337 138343 138347 138349 138353 138359 138365 138367 138373 138377 138379 138385 138389 138395 138403 199269
| 30×4= | 400÷5= | 5×24= | 96÷3═ |
| 2+320= | 16×5= | 34÷2= | 720-8= |
| 0÷（54-45）= | 297÷6≈ |