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6x^4+5x^3+25x^2+20x+4如何化简为:(x+1/2)(x+1/3)(6x^2+24)
题目详情
6x^4+5x^3 +25x^2 +20x +4 如何化简为:(x+1/2)(x+1/3)(6x^2+24)
▼优质解答
答案和解析
其实这个答案:(x+1/2)(x+1/3)(6x^2+24)还可以化简的.,最后一个式子可以提取公约数6
6x^4+5x^3 +25x^2 +20x +4=6x^4+24x^2 +5x^3+x^2+20x +4 (提取公因式)
=6x^2(x^2+4)+x^2(5x+1)+4(5x+1)
=6x^2(x^2+4)+(5x+1)(x^2+4)
=(x^2+4)(6x^2+5x+1) (十字相乘)
=(x^2+4)(2x+1)(3x+1) (分别乘以6,1/2,1/3,等式不变)
=(6x^2+24)(x+1/2)(x+1/3)
6x^4+5x^3 +25x^2 +20x +4=6x^4+24x^2 +5x^3+x^2+20x +4 (提取公因式)
=6x^2(x^2+4)+x^2(5x+1)+4(5x+1)
=6x^2(x^2+4)+(5x+1)(x^2+4)
=(x^2+4)(6x^2+5x+1) (十字相乘)
=(x^2+4)(2x+1)(3x+1) (分别乘以6,1/2,1/3,等式不变)
=(6x^2+24)(x+1/2)(x+1/3)
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