方程x三次方-3x-k-搜答案-智慧作业帮

2x^4-x^3+4x^3-2x^2-14x^2+7x-4x+2=0(2x-1)(x^3+2x^2-7x-2)=0(2x-1)(x^3-2x^2+4x^2-8x+x-2)=0(2x-1)(x-2)(x

x³+3x²+3x-7=0x³-x²+4x²+3x-7=0x²(x-1)+(x-1)(4x+7)=0(x-1)(x²+4x+7)=

不含x的三次方项则k-1=0k=1

x^4-x^3-3x-9=0(x²+3)(x²-3)-x(x²+3)=0(x²+3)(x²-x-3)=0x²+3=0无解x²-x-

x^3-4x+3=0x^3-x-3x+3=0x(x^2-1)-3(x-1)=0x(x-1)(x+1)-3(x-1)=0(x-1)(x^2+x-3)=0x-1=0或x^2+x-3=0x=1或x=(-1±

原式=3x的4四次方+(k-1)x³+x²+2不含x³则它的系数为0所以k-1=0k=1

x=0显然不是根.两边同时除以x^2得：3x^2-2x-2-2/x+3/x^2=0令t=x+1/x则x^2+1/x^2=t^2-2代入方程得：3(t^2-2)-2t-2=03t^2-2t-8=0(3t

3x^4-x^3+kx^3+x-1=3x^4+(-1+k)x^3+x-1不含x^3项,则-1+k=0k=1

题目是-x^3+3x^2-3x+5=0吗?核对一下有没有弄错的再问：其实题目是1/(x-2)+1/(x-1)=x-2/(1-x)再答：貌似你给的式子化不过去啊，还有，小月满满已经把你那个3次方的解决了

x^3+kx+3=x^3+1+kx+2=(x+1)(x^2-x+1)+k(x+1)-k+2因为上式能被x+1整除,则2-k=0得k=2

x四次方-3x三次方-8x平方+6x+4=0(x^4+x^3-2x^2)-4x^3-4x^2+8x-2x^2-2x+4=0x^2(x^2+x-2)-4x(x^2+x-2)-2(x^2+x-2)=0(x

x³-3=3/8x³=3+3/8x³=27/8x=3/2很高兴为您解答,【the1990】团队为您答题.请点击下面的【选为满意回答】按钮.

2x³+3x³-4x³=(2+3-4)x³=x³

可以由十字相乘法分解因式为（3x-8)(x+1)=0,解得x1为-1,x2为8/3再问：完整可以吗

令kx³-x³=0,所以k=1

8x^3-4x^2+kx+9=0的解为x=-1则将x=-1代入方程得;-8-4-k+9=0得：k=-3

x^3=27/8x=3/2

x三次方+x平方-5x+3=0x^3+x^2-2x-(3x-3)=0x(x^2+x-2)-3(x-1)=0x(x+2)(x-1)-3(x-1)=0(x-1)(x^2+2x-3)=0(x-1)(x+3)

17x的9次方,上式为2x的9次方-64x的9次方+81x的9次方

已知关于x的方程x方-2（k-3)x+k方-4k-1=01.方程有实数根,即b^2-4ac>=0,即4(k-3)^2-4(k^2-4k-1)>=0=>4(10-2k)>=0解得k的取值范围是k