把下列各式分解因式:(1)-8a的3次方b²+12ab的3次方c(2)3a(x-y)+9(y-x)
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(1)-8a的3次方b²+12ab的3次方c
=-4ab²(2a²-3bc)
(2)3a(x-y)+9(y-x)
=3(x-y)(a-3)
(3)(2m-3n)²-2m+3n
=(2m-3n)(2m-3n-1)
(4)16mn的4次方-m
=m(16n的4次方-1)
=m(4n²-1)(4n²+1)
=m(2n-1)(2n+1)(4n²+1)
=-4ab²(2a²-3bc)
(2)3a(x-y)+9(y-x)
=3(x-y)(a-3)
(3)(2m-3n)²-2m+3n
=(2m-3n)(2m-3n-1)
(4)16mn的4次方-m
=m(16n的4次方-1)
=m(4n²-1)(4n²+1)
=m(2n-1)(2n+1)(4n²+1)
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1.4ab² (3bc-2a²)
2.(x-y)(3a-9)=3(x-y)(a-3)
3.(2m-3n)(2m-3n-1)
4.m(16n^4-1)==m(4n²-1)(4n²+1)
=m(2n-1)(2n+1)(4n²+1)
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2.(x-y)(3a-9)=3(x-y)(a-3)
3.(2m-3n)(2m-3n-1)
4.m(16n^4-1)==m(4n²-1)(4n²+1)
=m(2n-1)(2n+1)(4n²+1)
望采纳!
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