4x的平方减4x加1等于0
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(2x减1)的平方等于x的平方加4x加4(2x-1)^2=x^2+4x+44x^2-4x+1=x^2+4x+43x^2-8x-3=0(3x+1)(x-3)=03x+1=0x1=-1/3x-3=0x2=
x²-4x+1=0x²+1=4x两边除以xx+1/x=4x+1/x=4两边平方x²+2+1/x²=16x²+1/x²=14
x²-4x+1=0两边除以x得x-4+1/x=0∴x+1/x=4再问:求x减x分之一的值.再答:你上面不是说求加吗?x²-4x+1=0两边除以x得x-4+1/x=0∴x+1/x=4
因式分解为(3x+2)(x-4)=0故x=-2/3x=4
有歧义啊啊!再问:?再答:你这说的太不清楚了,建议写下来拍照再问:再问:再问:再答:第一个是x+1/x+2再答:第二个是1/a+2再答:第三个太麻烦再问:再问:对不对?再答:对再答:分呢!
x²+4x+1=0x²+1=-4x两边除xx+x^(-1)=-4两边平方x²+2+x^(-2)=16x²+x^(-2)=14
答:x^2-4x+1=0显然,x不等于0,两边同除以x有:x-4+1/x=0x+1/x=4两边平方得:(x+1/x)^2=16x^2+2+1/x^2=16x^2-2+1/x^2=12所以:(x-1/x
x^2-4x+1=0易证x≠0等式两边除以x得x-4+1/x=0x+1/x=4(x+1/x)^2=16x^2+2+1/x^2=16x^2-2+1/x^2=12(x-1/x)^2=12x-1/x=±2√
x的n次方记作x^n.由方程得1=4x-x^2,x^2+1/x^2=x^2+(4x-x^2)/x^2=x^2+4/x-1=x^2+(16x-4x^2)/x-1=x^2+16-4x-1=x^2-4x+1
x²+x-²=14
X的平方减4X加1等于0x²+1=4x两边同时除以x,得x+1/x=4则(x+1/x)²=4²x²+2+1/x²=16所以x²+1/x
解题思路:利用一元二次方程根的判别式求解。解题过程:解:∵x2-2x+4=0∴△=(-2)2-4×1×4=4-16=-12<0∴此方程无解最终
x^2+1/x^2=4x^2-2+1/x^2=4-2x^2-2*x*1/x+1/x^2=2(x-1/x)^2=2x-1/x=根号2或-根号2
(x-3)²+4x(x-3)=0(x-3)[(x-3)+4x]=0(x-3)(5x-3)=0x1=3,x2=3/59(x-2)²=4(x+1)²3(x-2)=2(x+1)
(x-2)²-4(x+1)²=0平方差公式:[(x-2)+2(x+1)][(x-2)-2(x+1)]=03x(-x-4)=0x(x+4)=0x=0或x=-4
4x^2+8x+1=0x^2+2x+1/4=0(x+1)^2=3/4x+1=±√3/2x=-1±√3/2
X的平方加4X=(x+2)^2-4=0(x+2)^2=4x+2=2,或-2所以x=0,或x=-4