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Factor común por agrupación de términos: algunas expresiones polinomicas no se pueden factorizar directamente mediante los casos estudiados para ello es necesario hacer agrupaciones adecuadas de los terminos antes de factorizar
factorizar:
1: 4m - 8n
2: 20a² - 12a²b
3: 5x³ - 10x²
4: 6a² - 12a²b²
5: 3x+6+4x+8
6: ax+6x+ay+by
7: n²- n³ + 1 - n
8: 2xy-yz+6x²-3xz
9: x³ - 3x²+2x-6
10: h³+h-kh²-k