2(a+b)+3a(a+b)=()(a+b)-(x-y)的平方-(x-y)=-(x-y)()ab-ac+b-c3a-9b+2ac-6bc
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2(a+b)+3a(a+b)=()(a+b)-(x-y)的平方-(x-y)=-(x-y)()ab-ac+b-c3a-9b+2ac-6bc2(a+b)+3a(a+b)=()(a+b)-(x-y)的平方-
2(a+b)+3a(a+b)=()(a+b)-(x-y)的平方-(x-y)=-(x-y)()ab-ac+b-c3a-9b+2ac-6bc
2(a+b)+3a(a+b)=()(a+b)
-(x-y)的平方-(x-y)=-(x-y)()
ab-ac+b-c
3a-9b+2ac-6bc
2(a+b)+3a(a+b)=()(a+b)-(x-y)的平方-(x-y)=-(x-y)()ab-ac+b-c3a-9b+2ac-6bc
2+3a
(a+1)(b-c)
(a-3b)(3+2c)