已知a-b=2,(a-1)(b+2)小于ab :(1)求a的取值范围?(2)若a平方+2ab+a+b平方-b=38,求a+b的值?
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![已知a-b=2,(a-1)(b+2)小于ab :(1)求a的取值范围?(2)若a平方+2ab+a+b平方-b=38,求a+b的值?](/uploads/image/z/14902142-14-2.jpg?t=%E5%B7%B2%E7%9F%A5a-b%3D2%2C%EF%BC%88a-1%EF%BC%89%EF%BC%88b%2B2%EF%BC%89%E5%B0%8F%E4%BA%8Eab+%EF%BC%9A%EF%BC%881%EF%BC%89%E6%B1%82a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%3F%EF%BC%882%EF%BC%89%E8%8B%A5a%E5%B9%B3%E6%96%B9%2B2ab%2Ba%2Bb%E5%B9%B3%E6%96%B9-b%3D38%2C%E6%B1%82a%2Bb%E7%9A%84%E5%80%BC%3F)
已知a-b=2,(a-1)(b+2)小于ab :(1)求a的取值范围?(2)若a平方+2ab+a+b平方-b=38,求a+b的值?
已知a-b=2,(a-1)(b+2)小于ab :(1)求a的取值范围?(2)若a平方+2ab+a+b平方-b=38,求a+b的值?
已知a-b=2,(a-1)(b+2)小于ab :(1)求a的取值范围?(2)若a平方+2ab+a+b平方-b=38,求a+b的值?
1.(a-1)(b+2)
由(a-1)(b+2)
a<0
a+b=负6