初一因式分解(就两题) (1-x^2)(1-y^2)-4xy x^3+9 x^2+26x+24
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(1-x^2)(1-y^2)+4xy
=1-y^2-x^2+x^2y^2+4xy
=(x^2y^2+2xy+1)-(x^2-2xy+y^2)
=(xy+1)^2-(x-y)^2
=(xy+1+x-y)(xy+1-x+y)
x^3+9x^2+26x+24
=x^3+8x^2+16x+x^2+10x+25-1
=x(x+4)^2+(x+5)^2-1
=x(x+4)^2+(x+4)(x+6)
=(x+4)(x^2+4x+x+6)
=(x+4)(x+2)(x+3)
=1-y^2-x^2+x^2y^2+4xy
=(x^2y^2+2xy+1)-(x^2-2xy+y^2)
=(xy+1)^2-(x-y)^2
=(xy+1+x-y)(xy+1-x+y)
x^3+9x^2+26x+24
=x^3+8x^2+16x+x^2+10x+25-1
=x(x+4)^2+(x+5)^2-1
=x(x+4)^2+(x+4)(x+6)
=(x+4)(x^2+4x+x+6)
=(x+4)(x+2)(x+3)
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