因式分解:15abc-5bc² m(a-5)+2(5-a) (a-4)(a+1)+3a 4+12(x-y)+9
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因式分解:15abc-5bc² m(a-5)+2(5-a) (a-4)(a+1)+3a 4+12(x-y)+9(x-y)²
![因式分解:15abc-5bc² m(a-5)+2(5-a) (a-4)(a+1)+3a 4+12(x-y)+9](/uploads/image/z/19634666-50-6.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A15abc-5bc%26%23178%3B+m%EF%BC%88a-5%EF%BC%89%2B2%EF%BC%885-a%EF%BC%89+%EF%BC%88a-4%EF%BC%89%EF%BC%88a%2B1%EF%BC%89%2B3a+4%2B12%EF%BC%88x-y%EF%BC%89%2B9)
15abc-5bc²
=5bc(3a-c)
m(a-5)+2(5-a)
=m(a-5)-2(a-5)
=(m-2)(a-5)
(a-4)(a+1)+3a
=a²-3a-4+3a
=a²-4
=(a+2)(a-2)
4+12(x-y)+9(x-y)²
=2²+2*3(x-y)+[3(x-y)]²
=[2+3(x-y)]²
=5bc(3a-c)
m(a-5)+2(5-a)
=m(a-5)-2(a-5)
=(m-2)(a-5)
(a-4)(a+1)+3a
=a²-3a-4+3a
=a²-4
=(a+2)(a-2)
4+12(x-y)+9(x-y)²
=2²+2*3(x-y)+[3(x-y)]²
=[2+3(x-y)]²
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