初一简便计算11^2+13*66+39^2=已知x^2+4x+y^2-2y+5=0,x^2+y^2=( )若x^2-mx
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初一简便计算
11^2+13*66+39^2=
已知x^2+4x+y^2-2y+5=0,x^2+y^2=( )
若x^2-mx-6=(x+n)(x-3),m=( ),n=( )
11^2+13*66+39^2=
已知x^2+4x+y^2-2y+5=0,x^2+y^2=( )
若x^2-mx-6=(x+n)(x-3),m=( ),n=( )
![初一简便计算11^2+13*66+39^2=已知x^2+4x+y^2-2y+5=0,x^2+y^2=( )若x^2-mx](/uploads/image/z/3164752-64-2.jpg?t=%E5%88%9D%E4%B8%80%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%9711%5E2%2B13%2A66%2B39%5E2%3D%E5%B7%B2%E7%9F%A5x%5E2%2B4x%2By%5E2-2y%2B5%3D0%2Cx%5E2%2By%5E2%3D%28+%29%E8%8B%A5x%5E2-mx)
=11^2+2*11*39+39^2
=(11+39)^2=2500
(x+2)^2+(y-1)^2=0
x=-2 y=1
x^2+y^2=5
(x+n)(x-3)=x^2+(n-3)x-3n
3n=6 n=2
n-3=-m m=1
=(11+39)^2=2500
(x+2)^2+(y-1)^2=0
x=-2 y=1
x^2+y^2=5
(x+n)(x-3)=x^2+(n-3)x-3n
3n=6 n=2
n-3=-m m=1
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