2(3-5a)平方-5(3a-7)(3a+7)得多少

来源:学生作业帮助网 编辑:六六作业网 时间:2024/07/17 15:09:40
2(3-5a)平方-5(3a-7)(3a+7)得多少2(3-5a)平方-5(3a-7)(3a+7)得多少2(3-5a)平方-5(3a-7)(3a+7)得多少2(3-5a)平方-5(3a-7)(3a+7

2(3-5a)平方-5(3a-7)(3a+7)得多少
2(3-5a)平方-5(3a-7)(3a+7)得多少

2(3-5a)平方-5(3a-7)(3a+7)得多少
2(3-5a)平方-5(3a-7)(3a+7)
=2(25a²-30a+9)-5(9a²-49)
=50a²-60a+18-45a²+245
=5a²-60a+263

20a²-60a+263?