已知a+b=A,ab=A+2008,1-2(a+ab)+(ab-2b)=3A.你能确定a+b与ab的值吗?
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![已知a+b=A,ab=A+2008,1-2(a+ab)+(ab-2b)=3A.你能确定a+b与ab的值吗?](/uploads/image/z/3744580-4-0.jpg?t=%E5%B7%B2%E7%9F%A5a%2Bb%3DA%2Cab%3DA%2B2008%2C1-2%28a%2Bab%29%2B%28ab-2b%29%3D3A.%E4%BD%A0%E8%83%BD%E7%A1%AE%E5%AE%9Aa%2Bb%E4%B8%8Eab%E7%9A%84%E5%80%BC%E5%90%97%3F)
已知a+b=A,ab=A+2008,1-2(a+ab)+(ab-2b)=3A.你能确定a+b与ab的值吗?
已知a+b=A,ab=A+2008,1-2(a+ab)+(ab-2b)=3A.你能确定a+b与ab的值吗?
已知a+b=A,ab=A+2008,1-2(a+ab)+(ab-2b)=3A.你能确定a+b与ab的值吗?
1-2(a+ab)+(ab-2b)=3A
1-2a-2ab+ab-2b=3A
1-2(a+b)-ab=3A
1-2A-(A+2008)=3A
1-2A-A-2008=3A
6A=-2007
A=-334.5
a+b=A=-334.5
ab=A+2008=1673.5
可以
式子1-2(a+ab)+(ab-2b)=3A可化简为1-2(a+b)-ab=3A
将a+b=A,ab=A+2008代入上式可得,A=-334.5
那么a+b=-334.5,ab=1673.5
1-2(a+ab)+(ab-2b)=3A
1-2a-2ab+ab-2b=3A
1-2(a+b)-ab=3A
1-2A-(A+2008)=3A
1-2A-A-2008=3A
6A=-2007
A=-334.5
a+b=A=-334.5
ab=A+2008=1673.5