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①原式=(x³-xy²)-(12xy²-12y³)
=x(x+y)(x-y)-12y²(x-y)
=(x-y)(x²+xy-12y²)
=(x-y)(x+4y)(x-3y)
②原式=(x³-8)+(3x²+3x-18)
=(x-2)(x²+2x+4)+3(x+3)(x-2)
=(x-2)(x²+2x+4+3x+9)
=(x-2)(x²+5x+13)
=x(x+y)(x-y)-12y²(x-y)
=(x-y)(x²+xy-12y²)
=(x-y)(x+4y)(x-3y)
②原式=(x³-8)+(3x²+3x-18)
=(x-2)(x²+2x+4)+3(x+3)(x-2)
=(x-2)(x²+2x+4+3x+9)
=(x-2)(x²+5x+13)
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展开全部
①x^3-13xy^2+12y^3
=x^3-xy^2-(12xy^2-12y^3)
=x(x^2-y^2)-12y^2(x-y)
=x(x-y)(x+y)-12y^2(x-y)
=(x-y)(x^2+xy-12y^2)
=(x-y)(x+4y)(x-3y)
②x^3+3x^2+3x-26
=x^3+3x^2+3x+1-27
=(x+1)^3-3^3
=(x+1-3)[(x+1)^2+3(x+1)+9)]
=(x-2)(x^2+5x+13)
=x^3-xy^2-(12xy^2-12y^3)
=x(x^2-y^2)-12y^2(x-y)
=x(x-y)(x+y)-12y^2(x-y)
=(x-y)(x^2+xy-12y^2)
=(x-y)(x+4y)(x-3y)
②x^3+3x^2+3x-26
=x^3+3x^2+3x+1-27
=(x+1)^3-3^3
=(x+1-3)[(x+1)^2+3(x+1)+9)]
=(x-2)(x^2+5x+13)
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展开全部
1、x^3-13xy^2+12y^3
=x^3-xy^2-12xy^2+12y^3
=x(x^2-y^2)-12y^2(x-y)
=x(x+y)(x-y)-12y^2(x-y)
=(x-y)[x(x+y)-12y^2]
=(x-y)(x^2+xy-12y^2)
=(x-y)(x-3y)(x+4y)
=x^3-xy^2-12xy^2+12y^3
=x(x^2-y^2)-12y^2(x-y)
=x(x+y)(x-y)-12y^2(x-y)
=(x-y)[x(x+y)-12y^2]
=(x-y)(x^2+xy-12y^2)
=(x-y)(x-3y)(x+4y)
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