
求因式分解1.1.4三道习题
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1.1 x^4+4
=(x^2)^2+2^2+2*2*x^2-4x^2
=(x^2+2)^2-4x^2
=(x^2+2)^2-(2x)^2
=(x^2+2+2x)(x^2+2-2x)
=(x^2)^2+2^2+2*2*x^2-4x^2
=(x^2+2)^2-4x^2
=(x^2+2)^2-(2x)^2
=(x^2+2+2x)(x^2+2-2x)
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1.2
x^3-3x^2+4
=x^3-2x^2-x^2+4
=x^2(x-2)-(x^2-4)
=x^2(x-2)-(x+2)(x-2)
=(x-2)[x^2-(x+2)]
=(x-2)(x^2-x-2)
=(x-2)(x-2)(x+1)
=(x-2)^2(x+1)
1.3
x^4+x^3-3x^2-4x-4
=(x^4+x^3+x^2)-4x^2-4x-4
=x^2(x^2+x+1)-4(x^2+x+1)
=(x^2+x+1)(x^2-4)
=(x^2+x+1)(x+2)(x-2)
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