8a-4a²-4 (a-b)²+4ab (x-2y)²-2x+4y+1x²+(y²-2y+1)- a的三次方+a²b - 四分之一ab²
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![8a-4a²-4 (a-b)²+4ab (x-2y)²-2x+4y+1x²+(y²-2y+1)- a的三次方+a²b - 四分之一ab²](/uploads/image/z/9307971-27-1.jpg?t=8a-4a%26%23178%3B-4+%EF%BC%88a-b%EF%BC%89%26%23178%3B%2B4ab+%EF%BC%88x-2y%EF%BC%89%26%23178%3B-2x%2B4y%2B1x%26%23178%3B%2B%EF%BC%88y%26%23178%3B-2y%2B1%EF%BC%89-+a%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%2Ba%26%23178%3Bb+-+%E5%9B%9B%E5%88%86%E4%B9%8B%E4%B8%80ab%26%23178%3B)
8a-4a²-4 (a-b)²+4ab (x-2y)²-2x+4y+1x²+(y²-2y+1)- a的三次方+a²b - 四分之一ab²
8a-4a²-4 (a-b)²+4ab (x-2y)²-2x+4y+1
x²+(y²-2y+1)
- a的三次方+a²b - 四分之一ab²
8a-4a²-4 (a-b)²+4ab (x-2y)²-2x+4y+1x²+(y²-2y+1)- a的三次方+a²b - 四分之一ab²
8a-4a²-4
=-4(a^2-2a+1)
=-4(a-1)^2
(a-b)²+4ab
=a^2-2ab+b^2+4ab
=a^2+2ab+b^2
=(a+b)^2
(x-2y)²-2x+4y+1
=(x-2y)²-2(x-2y)+1
=(x-2y-1)^2
x²+(y²-2y+1)
=x²+(y-1)²
不能继续分解了
- a的三次方+a²b - 四分之一ab²
=-a/4*(4a^2-4ab+b^2)
=-a/4*(2a-b)^2