a-6ab+9ab²=x²-x+1/4=9x²-6x+1=x²+7x+6=
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![a-6ab+9ab²=x²-x+1/4=9x²-6x+1=x²+7x+6=](/uploads/image/z/882299-11-9.jpg?t=a-6ab%2B9ab%26%23178%3B%3Dx%26%23178%3B-x%2B1%2F4%3D9x%26%23178%3B-6x%2B1%3Dx%26%23178%3B%2B7x%2B6%3D)
a-6ab+9ab²=x²-x+1/4=9x²-6x+1=x²+7x+6=
a-6ab+9ab²=
x²-x+1/4=
9x²-6x+1=
x²+7x+6=
a-6ab+9ab²=x²-x+1/4=9x²-6x+1=x²+7x+6=
a-6ab+9ab²=a(1-6b+9b^2)=a(1-3b)^2
x²-x+1/4=(x-1/*2)^2
9x²-6x+1=(3x-1)^2
x²+7x+6=(x+1)(x+6)十字相乘