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4x的三次方减去2x的平方减去3x加1等于零

因为 x² + 3x - 1 = 0 所以 x^3 + 4x² + 2x + 18 = x^3 + 3x² - x +x² + 3x + 18 = x(x² + 3x -1) + x² + 3x + 18 = x² + 3x + 18 = x² + 3x - 1 + 19 = 19

=2x(x^2-2x-1)+(x^2-2x-1)+3=3

因为这里书写不便,故将我的答案做成图像贴于下方,谨供楼主参考(若图像显示过小,点击图片可放大)

x³-3x+2=0 (x-1)²(x+2)=0 x=1或x=-2

1.x^3=x(x^2-25)=x(x^2-5^2)=x(x-5)(x+5) 2.1-4x^2=1-(2x)^2=(1-2x)(1+2x) 3.x^3-4x^2+4x=x(x^2-2x+1)=x(x-1)^2 4.25x^2+20xy+4y^2=(5x)^2+2*5x*2y+(2y)^2=(5x+2y)^2 好像是这样,^表示次方的意思。

(2x-3)²-(x+y)(x-y)-y² ,x²一4x一1=0 ,x²一4x=1 =4x^2-12x+9-x^2+y^2-y^2 =3x^2-12x+9 =3(x^2-4x)+9 =3+9 =12

x=√2+1 x-1=√2 两边平方 x²-2x+1=2 x²-2x=1 所以4x^4+4x³-9x²-2x+1 =(4x^4-8x³)+(12x³-24x²)+(15x²-30x)+28x+1 =4x²(x²-2x)+12x(x²-2x)+15(x²-2x)+28x+1 =4x²+12x+15+28x+1 =...

x²+4x-1=0 x²+4x=1 2x的四次方加8x的三次方减4x的平方减8x加1 =2x²(x²+4x)-4x²-8x+1 =2x²-4x²-8x+1 =-2x²-8x+1 =-2(x²+4x)+1 =-2+1 =-1

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