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20楼#
发布于:2018-08-04 17:38
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21楼#
发布于:2018-08-04 17:37
lsj20030703:不说好是(a+b)平方=a方+2ab+b方;(a-b)方=a方-2ab-b方,(a+b)(a-b)=a方-b方吗????已经被开出来了 |
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22楼#
发布于:2018-08-04 17:37
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23楼#
发布于:2018-08-04 17:37
lsj20030703:不说好是(a+b)平方=a方+2ab+b方;(a-b)方=a方-2ab-b方,(a+b)(a-b)=a方-b方吗????但a是未知数 |
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24楼#
发布于:2018-08-04 17:37
咋感觉这题那么怪,,,
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25楼#
发布于:2018-08-04 17:36
lsj20030703:不说好是(a+b)平方=a方+2ab+b方;(a-b)方=a方-2ab-b方,(a+b)(a-b)=a方-b方吗????嗯,没错 |
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26楼#
发布于:2018-08-04 17:36
不说好是(a+b)平方=a方+2ab+b方;(a-b)方=a方-2ab-b方,(a+b)(a-b)=a方-b方吗????
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27楼#
发布于:2018-08-04 17:33
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28楼#
发布于:2018-08-04 17:32
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29楼#
发布于:2018-08-04 17:31
lsj20030703:感觉这题都有病回到原帖嗯哒 |
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