1.9(a²-b²)+12(a²+b²) 2.(x²-2x)²
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1.9(a²-b²)+12(a²+b²) 2.(x²-2x)²+2x²-4x+1
3.49(x-y)²-25(x+y)² 4.81x的五次方y的五次方-16xy 5.(x²-5x)²-36
3.49(x-y)²-25(x+y)² 4.81x的五次方y的五次方-16xy 5.(x²-5x)²-36
1.9(a²-b²)+12(a²+b²) =9a²-9b²+12a²+12b²=21a²-3b²=3﹙7a²-b²﹚;
2.(x²-2x)²+2x²-4x+1=﹙x-1﹚^4;
3.49(x-y)²-25(x+y)²=﹙7x-7y-5x-5y﹚﹙7x-7y+5x+5y﹚
=4﹙x-6y﹚﹙6x-y﹚;
4.81x^5y^5-16xy = xy﹙3xy-2﹚﹙3xy+2﹚﹙9x²y²+4﹚;
5.(x²-5x)²-36=﹙x-6﹚﹙x+1﹚﹙x-2﹚﹙x-3﹚.
2.(x²-2x)²+2x²-4x+1=﹙x-1﹚^4;
3.49(x-y)²-25(x+y)²=﹙7x-7y-5x-5y﹚﹙7x-7y+5x+5y﹚
=4﹙x-6y﹚﹙6x-y﹚;
4.81x^5y^5-16xy = xy﹙3xy-2﹚﹙3xy+2﹚﹙9x²y²+4﹚;
5.(x²-5x)²-36=﹙x-6﹚﹙x+1﹚﹙x-2﹚﹙x-3﹚.
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