1.(x^2-x-2)(x^2+11x+28)-19 2.(x-2)(x+1)(x-4)(x+8)+54x^2 注:不用
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1.(x^2-x-2)(x^2+11x+28)-19 2.(x-2)(x+1)(x-4)(x+8)+54x^2 注:不用换元法,因式分解
1.(x^2-x-2)(x^2+11x+28)-19
=(x+1)(x-2)(x+4)(x+7)-19
=[(x+1)(x+4)][(x-2)(x+7)]-19
=[x^2+5x+4][x^2+5x-14]
=(x^2+5x)^2-10(x^2+5x)-56-19
=(x^2+5x)^2-10(x^2+5x)-75
=(x^2+5x+5)(x^2+5x-15)
=[x+(5+√5)/2][x+(5-√5)/2][x+(5+√85)/2][x+(5-√85)/2] (这一步如果算错了,请多包涵)
2.(x-2)(x+1)(x-4)(x+8)+54x^2
=[(x-2)(x-4)][(x+1)(x+8)]+54x^2
=[x^2+8-6x][x^2+8+9x]+54x^2
=(x^2+8)+3x(x^2+8)-54x^2+54x^2
=(x^2+8)+3x(x^2+8)
=(x^2+8)(x^2+3x+8)
(如果觉得答案还算满意,并且另有难题,请记住我的名字,阿古施毕亚,联系我,知无不言,言无不尽)
=(x+1)(x-2)(x+4)(x+7)-19
=[(x+1)(x+4)][(x-2)(x+7)]-19
=[x^2+5x+4][x^2+5x-14]
=(x^2+5x)^2-10(x^2+5x)-56-19
=(x^2+5x)^2-10(x^2+5x)-75
=(x^2+5x+5)(x^2+5x-15)
=[x+(5+√5)/2][x+(5-√5)/2][x+(5+√85)/2][x+(5-√85)/2] (这一步如果算错了,请多包涵)
2.(x-2)(x+1)(x-4)(x+8)+54x^2
=[(x-2)(x-4)][(x+1)(x+8)]+54x^2
=[x^2+8-6x][x^2+8+9x]+54x^2
=(x^2+8)+3x(x^2+8)-54x^2+54x^2
=(x^2+8)+3x(x^2+8)
=(x^2+8)(x^2+3x+8)
(如果觉得答案还算满意,并且另有难题,请记住我的名字,阿古施毕亚,联系我,知无不言,言无不尽)
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
(x/x-1)+(5x-2)/x*x-x=1 求x(有图)
(x-1)^3(x+1)(x-2)/(x+4)
(x+1)(x+2)(x+3)(x+4)+1
化简{x²-2x分之x+2-x²-4x+4x分之x-1}除以X分之(x-1)(X-4)乘以(2-x)
(x+2/x+1)-(x+4/x+3)-(x+3/x+2)+(x+5/x+4)
计算(x*x+4x+5)/(x+2)-(x*x+6x+10)/(x+3)+1
[(x+2)/(x²+2x)-(x-1)/(x²-4x+4)]÷(x-4)/x
解方程:(x-8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)
1.(x²-x+2)(-x-2-x²)
计算 x(x+3)-(x-1)(x-2)
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