-5(5a-2b+c)-2(3a-5(a-2b-3a))

学习时间:2026-04-02 08:40:41 阅读：5189

-5(5a-2b+c)-2(3a-5(a-2b-3a))-5(5a-2b+c)-2(3a-5(a-2b-3c)-2)

开心的龙猫

2026-04-02 08:40:41

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-5(5a-2b+c)-2[3a-5(a-2b-3c)]=-25a+10b-5c-2[3a-5a+10b+15c]=-25a+10b-5c-2[-2a+10b+15c]=-25a+10b-5c+4a-20b-30c=-21a-10b-35c