3a²-7a-6 6x²-11xy+3y² 4m²+8mn+3n² 10x²-21xy+2y²
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3a²-7a-66x²-11xy+3y²4m²+8mn+3n²10x²-21xy+2y²3a²-7a-66x²
3a²-7a-6 6x²-11xy+3y² 4m²+8mn+3n² 10x²-21xy+2y²
3a²-7a-6 6x²-11xy+3y² 4m²+8mn+3n² 10x²-21xy+2y²
3a²-7a-6 6x²-11xy+3y² 4m²+8mn+3n² 10x²-21xy+2y²
3a²-7a-6=(3a+2)(a-3)
6x²-11xy+3y² =(3x-y)(2x-3y)
4m²+8mn+3n² =(2m+3n)(2m+n)
10x²-21xy+2y²=(10x-y)(x-2y)
（a-3）*（3a+2）
(2x-3)*(3x-y)
(10x-y)*(x-2y)