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
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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(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(x-y)²
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