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发表于 2019-9-13 23:46:11 | 显示全部楼层 |阅读模式
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1.1????? 1.2.5,

43,106; ?1,?1.732,?3.14,?62

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9. +5m??????5???????????????0????????? 1.2.1?????

1?????????????????????????????????????

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2.1.2??: 1?B 2?C 3?D 4?D 5?D 6?4?4??1??37?3??5 8?2a2

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2

4?D5?2?2x+x?=20 6????600x 7?6

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3.2 ????????????: 1??18 2?24 3?B 4?B 5??1?????0.3x+2.7x

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8

3.3 ?????????????????

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5

9 3?854?D 5?B

6??1?x=312 ?2?x=1 ?3????3?5x4?5?2x3?1?1?3x2??x=?1

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2.?AOB,?BOC,?AOD,?COD;?BOD,?COD,?AOC,?AOB 3.?AOB,?AOB 4-7.DCCB 8.40?1209.?AOB=?A?OB,?AOA?=?BOB? 10. ??ABE=x,?2x+21=5x-21,??x=14,???ABC=1437=98?11?OE???BOC??AOD+?EOB=90, ???AOC+?BOC=180, OE???BOC?OD??AOC???????2?DOC+2?EOC=180,???DOE=90? 4.3.3 ????????

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