因式分解1.-4x²+4xy-y² 2.4t²-12t+9一共四题 3.16m²-72mn+81n² 4.4a²-4a(b+c)+(b+c)²
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![因式分解1.-4x²+4xy-y² 2.4t²-12t+9一共四题 3.16m²-72mn+81n² 4.4a²-4a(b+c)+(b+c)²](/uploads/image/z/2683005-69-5.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A31.-4x%26%23178%3B%2B4xy-y%26%23178%3B+2.4t%26%23178%3B-12t%2B9%E4%B8%80%E5%85%B1%E5%9B%9B%E9%A2%98+3.16m%26%23178%3B-72mn%2B81n%26%23178%3B+4.4a%26%23178%3B-4a%28b%2Bc%29%2B%28b%2Bc%29%26%23178%3B)
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因式分解1.-4x²+4xy-y² 2.4t²-12t+9一共四题 3.16m²-72mn+81n² 4.4a²-4a(b+c)+(b+c)²
因式分解1.-4x²+4xy-y² 2.4t²-12t+9
一共四题 3.16m²-72mn+81n² 4.4a²-4a(b+c)+(b+c)²
因式分解1.-4x²+4xy-y² 2.4t²-12t+9一共四题 3.16m²-72mn+81n² 4.4a²-4a(b+c)+(b+c)²
1.-4x²+4xy-y² =﹣﹛﹙2x﹚²﹣2×2x·y+y² ﹜=﹣(2x-y)²
2.4t²-12t+9=﹙2t﹚²-2×2t·3+3²=(2t-3)²
3.16m²-72mn+81n² =﹙4m﹚²-2×4m×9n+﹙9n﹚² =﹙4m-9n)²
4.4a²-4a(b+c)+(b+c)²=﹙2a﹚²-2×2a(b+c)+(b+c)²=﹙2a﹣b﹣c)²