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539????????-????????????
???539???????????????????????????????????????????????3?5??????????????????????????????????????????????????????????????????????????????????????
??539?????????-??????????
| ??539 | ???? |
|---|---|
| ?? | 5300 |
| ?? | 53000 |
| ?? | 800000 |
539???????
| ??? | ???? |
|---|---|
| 80 | 5300 |
539???????
| ??? | ???? |
|---|---|
| 80 | 53000 |
539???
| ???? | ???? | ???? | |||
| ?? | ?? | ?? | ?? | ?? | ?? |
| 3??? | 3? | 3??? | 1 | 4??? | 1? |
| 4??? | 6? | 4??? | 4? | 5??? | 5? |
| 5??? | 10? | 5??? | 10? | 6??? | 15? |
| 6??? | 15? | 6??? | 20? | 7??? | 35? |
| 7??? | 21? | 7??? | 35? | 8??? | 70? |
| 8??? | 28? | 8??? | 56? | 9??? | 126? |
| 9??? | 36? | 9??? | 84? | 10??? | 210? |
| 10??? | 45? | 10??? | 120? | 11??? | 330? |
| 11??? | 55? | 11??? | 168? | 12??? | 495? |
| 12??? | 66? | 12??? | 220? | 13??? | 715? |
| 13??? | 78? | 13??? | 286? | 14??? | 1001? |
| 14??? | 91? | 14??? | 364? | 15??? | 1365? |
| 15??? | 105? | 15??? | 455? | 16??? | 1820? |
| 16??? | 120? | 16??? | 560? | 17??? | 2380? |
| 17??? | 136? | 17??? | 680? | 18??? | 3060? |
| 18??? | 153? | 18??? | 916? | 19??? | 3876? |
| 19??? | 171? | 19??? | 969? | 20??? | 4845? |
| 20??? | 190? | 20??? | 1140? | 21??? | 5985? |
539????
?????539???????????????????????????????????????????????????????????
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- ????????
- ???????=??×(??-1)÷2
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??4????4X(4-1)+2=12+2=14?
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- ????????
- ???????=??×(??-1)×(??-2)÷6
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??5????5×(5-1)×(5-2)+6=60+6=66?
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- ????????
- ???????=??×(??-1)×(??-2)×(??-3)÷24
??
??6????6×(6-1)×(6-2)×(6-3)-24=360-24=336?
??????????
- ????????? × (?? – 1) + 2
- ????????? × (?? – 1) × (?? – 2) + 6
- ????????? × (?? – 1) × (?? – 2) × (?? – 3) – 24
539??????
539??????????????????539??????????????????????????????????????????
5300?
53000?
800000
??????? × (???? – 1) + 2
??????? × (???? – 1) × (???? – 2) + 6
??????? × (???? – 1) × (???? – 2) × (???? – 3) – 24
???????????
| ?? | ?? | ?? |
|---|---|---|
| ?? | ?????????????????????? | ????????????????????????????????? |
| ?? | ??????????????????????????????? | ?????????????????????????? |
| ?? | ????????????????????????????????????????? | ?????????????????????? |
| ?? | ???????????????????? | ?????????????????????? |
| ???? | ??????????????????????????????? | ????????????????????? |
539????
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- ??????2??????8??????28????
- ?????28? × 10? = 280?
- ?????
- ??????3??????8??????56????
- ?????56? × 10? = 560?
- ?????
- ??????4??????8??????70????
- ?????70? × 10? = 700?
?????
- ?????280?
- ?????560?
- ?????700?
- ????280 + 560 + 700 = 1540?
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- ?2?04?05?06
- ?3?07?08?09
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