1398| 4
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請(qǐng)問(wèn)這個(gè)公式推導(dǎo)錯(cuò)在了哪里 |
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點(diǎn)評(píng)
重心的位置都沒(méi)確定,,你就來(lái)個(gè)P1+P3=P2+P4,順嘴胡扯是吧
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