帮忙配一下以下3个方程y=1+6x-x^2y=1/2x^2+2x+1y=1/4x^2+x-4
2019-06-24
帮忙配一下以下3个方程
y=1+6x-x^2
y=1/2x^2+2x+1
y=1/4x^2+x-4
优质解答
y=1+6x-x²
=-（x²-6x-1）
=-（x²-6x+9-10）
=-（x-3）²+10
y=1/2x^2+2x+1
=1/2×（x²+4x）+1
=1/2×（x²+4x+4-4）+1
=1/2×（x+2）²-2+1
=1/2×（x+2）²-1
y=1/4x^2+x-4
=1/4×（x²+4x）-4
=1/4×（x²+4x+4-4）-4
=1/4×（x+2）²-1-4
=1/4×（x+2）²-5
y=1+6x-x²
=-（x²-6x-1）
=-（x²-6x+9-10）
=-（x-3）²+10
y=1/2x^2+2x+1
=1/2×（x²+4x）+1
=1/2×（x²+4x+4-4）+1
=1/2×（x+2）²-2+1
=1/2×（x+2）²-1
y=1/4x^2+x-4
=1/4×（x²+4x）-4
=1/4×（x²+4x+4-4）-4
=1/4×（x+2）²-1-4
=1/4×（x+2）²-5