分解因式 初二数学题 求解!急用!
2个回答
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x^9+x^6+x^3-3
=x^9+x^6+x^3-1-1-1
= (x^9-1)+( x^6-1)+ (x^3 -1)
=(x^3 -1)(x^6+x^3+1)+ (x^3 -1)(x^3 +1)+ (x^3 -1)
=(x^3 -1)(x^6+2x^3+3)
=(x-1)(x^2+x+1)(x^6+2x^3+3)
a^3b-ab^3+a^2+b^2+1
=a^3b-a^2b^2+a^2b^2+ab-ab-ab^3+a^2+b^2+1
=a^3b-a^2b^2+ab+a^2b^2-ab^3+b^2+a^2-ab+1
=ab(a^2-ab+1)+b^2(a^2-ab+1)+1(a^2-ab+1)
=(ab+b^2+1)(a^2-ab-1)
=x^9+x^6+x^3-1-1-1
= (x^9-1)+( x^6-1)+ (x^3 -1)
=(x^3 -1)(x^6+x^3+1)+ (x^3 -1)(x^3 +1)+ (x^3 -1)
=(x^3 -1)(x^6+2x^3+3)
=(x-1)(x^2+x+1)(x^6+2x^3+3)
a^3b-ab^3+a^2+b^2+1
=a^3b-a^2b^2+a^2b^2+ab-ab-ab^3+a^2+b^2+1
=a^3b-a^2b^2+ab+a^2b^2-ab^3+b^2+a^2-ab+1
=ab(a^2-ab+1)+b^2(a^2-ab+1)+1(a^2-ab+1)
=(ab+b^2+1)(a^2-ab-1)
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x∧9+x∧6+x³-3
=【(x³)³-1】+【(x²)³-1】+【x³-1】
=(x³-1﹚【(x³)²+(1)²+x³】+(x²-1)【x⁴+x²+1】+(x-1)【x²+x+1】
=(x-1)(x²+x+1)(x∧6+x³+1﹚+(x+1)(x-1)(x⁴+x²+1)+(x-1)(x²+x+1)
=(x-1)【(x²+x+1)(x∧6+x³+1)+(x+1)(x⁴+x²+1)+x²+x+1】
=(x-1)(x·∧8+x∧7+x∧6+2x∧5+2x⁴+2x³+3x²+3x+3);
=【(x³)³-1】+【(x²)³-1】+【x³-1】
=(x³-1﹚【(x³)²+(1)²+x³】+(x²-1)【x⁴+x²+1】+(x-1)【x²+x+1】
=(x-1)(x²+x+1)(x∧6+x³+1﹚+(x+1)(x-1)(x⁴+x²+1)+(x-1)(x²+x+1)
=(x-1)【(x²+x+1)(x∧6+x³+1)+(x+1)(x⁴+x²+1)+x²+x+1】
=(x-1)(x·∧8+x∧7+x∧6+2x∧5+2x⁴+2x³+3x²+3x+3);
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