作业帮如果[a+b]的平方与2a-b-3的绝对值是互为相反数,那么ab=?....................................................................................................................................................................................
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/15 18:36:12
![如果[a+b]的平方与2a-b-3的绝对值是互为相反数,那么ab=?....................................................................................................................................................................................](/uploads/image/z/1010005-61-5.jpg?t=%E5%A6%82%E6%9E%9C%5Ba%2Bb%5D%E7%9A%84%E5%B9%B3%E6%96%B9%E4%B8%8E2a-b-3%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC%E6%98%AF%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C%E9%82%A3%E4%B9%88ab%3D%3F....................................................................................................................................................................................)
如果[a+b]的平方与2a-b-3的绝对值是互为相反数,那么ab=?....................................................................................................................................................................................
如果[a+b]的平方与2a-b-3的绝对值是互为相反数,那么ab=?
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如果[a+b]的平方与2a-b-3的绝对值是互为相反数,那么ab=?....................................................................................................................................................................................
如果[a+b]的平方与2a-b-3的绝对值是互为相反数,
即[a+b]的平方+|2a-b-3|=0
a+b=0
2a-b-3=0
解方程组得
a=1,b=-1
那么ab=-1
[a+b]的平方与2a-b-3的绝对值是互为相反数，
a+b=0
2a-b-3=0
3a=3
a=1
b=-1
ab==-1