1.m^2+13m+1=0,m^3+12m^2-12m+2004=?2.已知x=a^2+2a+b^2,y=4b-7,比较x、y的大小
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![1.m^2+13m+1=0,m^3+12m^2-12m+2004=?2.已知x=a^2+2a+b^2,y=4b-7,比较x、y的大小](/uploads/image/z/8896493-29-3.jpg?t=1.m%5E2%2B13m%2B1%3D0%2Cm%5E3%2B12m%5E2-12m%2B2004%3D%3F2.%E5%B7%B2%E7%9F%A5x%3Da%5E2%2B2a%2Bb%5E2%2Cy%3D4b-7%2C%E6%AF%94%E8%BE%83x%E3%80%81y%E7%9A%84%E5%A4%A7%E5%B0%8F)
1.m^2+13m+1=0,m^3+12m^2-12m+2004=?2.已知x=a^2+2a+b^2,y=4b-7,比较x、y的大小
1.m^2+13m+1=0,m^3+12m^2-12m+2004=?2.已知x=a^2+2a+b^2,y=4b-7,比较x、y的大小
1.m^2+13m+1=0,m^3+12m^2-12m+2004=?2.已知x=a^2+2a+b^2,y=4b-7,比较x、y的大小
m^3+12m^2-12m+2004
=m³+13m²+m-m²-13m+2004
=m(m²+13m+1)-(m²+13m+1)+2005
=0-0+2005
=2005
x-y=a²+2a+b²-4b+7=(a+1)²+(b-2)²+2>0
∴x>y