八年级数学问题
把二次三项式2/1y^2-3y+1配方成a(x+m)^2+n的形式,
如2x^2-4x-3=2(x+m)^2-5.
答对本人给高分,急用!!!!!!!!!!明天交的作业
参考答案:2/1y^2-3y+1
=1/2(y^2-6y)+1
=1/2(y^2-6y+9-9)+1
=1/2(y^2-6y+9)-1/2*9+1
=1/2(y-3)^2-7/2
把二次三项式2/1y^2-3y+1配方成a(x+m)^2+n的形式,
如2x^2-4x-3=2(x+m)^2-5.
答对本人给高分,急用!!!!!!!!!!明天交的作业
参考答案:2/1y^2-3y+1
=1/2(y^2-6y)+1
=1/2(y^2-6y+9-9)+1
=1/2(y^2-6y+9)-1/2*9+1
=1/2(y-3)^2-7/2